Master ABOS Orthopaedic Review: Bone Tumors, Skeletal Dysplasias & Arthritis Essentials | Part 29

Question 1

A 5-year-old female is diagnosed with Langerhans Cell Histiocytosis after presenting with a painful swelling in her rib. During her workup, the orthopaedic surgeon is aware that patients with LCH can develop systemic complications. Which of the following endocrine disorders is specifically mentioned as a potential complication?

• A) Hypothyroidism
• B) Adrenal insufficiency
• C) Diabetes insipidus
• D) Hyperparathyroidism
• E) Growth hormone deficiency

Question 2

A 12-year-old male undergoes a biopsy for a lytic lesion in his ilium, suspected to be Langerhans Cell Histiocytosis. Histological examination is performed. Which of the following cell types is a characteristic feature of LCH lesions, often described with an indented nucleus?

• A) Osteoblasts
• B) Chondrocytes
• C) Plasma cells
• D) Langerhans cells
• E) Giant cells

Question 3

A 3-year-old female presents with a palpable swelling on her forehead. Radiographs of the skull reveal a destructive lesion. A biopsy confirms Langerhans Cell Histiocytosis. Which of the following best describes the typical radiographic appearance of such a lesion in the skull?

• A) Sclerotic lesion with periosteal reaction
• B) Well-circumscribed lesion with a sclerotic rim
• C) Destructive lesion with ill-defined margins
• D) Expansile lesion with internal calcifications
• E) Multiple small punctate calcifications

Question 4

A 15-year-old male presents with persistent pain and swelling in his left hip. Imaging reveals a lytic lesion in the ilium. A biopsy is performed, confirming Langerhans Cell Histiocytosis. Based on the provided information, which of the following statements regarding the presentation of LCH is most accurate?

• A) LCH lesions are typically asymptomatic and discovered incidentally.
• B) LCH lesions are most commonly found in the small bones of the hands and feet.
• C) LCH lesions are usually symptomatic, presenting with pain and swelling.
• D) LCH primarily affects patients over the age of 60.
• E) LCH is a benign condition that rarely requires intervention.

Question 5

A 2-year-old child is evaluated for a new onset of hearing loss. Physical examination reveals no obvious external ear abnormalities. Imaging studies show a lytic lesion involving the mastoid bone. A biopsy is planned to investigate for Langerhans Cell Histiocytosis. What is the specific association between mastoid involvement and hearing loss in LCH?

• A) Mastoid involvement causes conductive hearing loss due to ossicular chain destruction.
• B) Mastoid involvement leads to sensorineural hearing loss due to cochlear damage.
• C) Mastoid involvement is a common cause of central auditory processing disorder.
• D) Mastoid involvement is associated with hearing loss, as stated in the clinical context.
• E) Mastoid involvement typically causes tinnitus but not significant hearing loss.

Question 6

A 10-year-old girl presents with a painful swelling over her left rib. Radiographs show a lytic lesion. A biopsy is performed, and the pathologist notes the presence of numerous eosinophils in addition to other inflammatory cells. Which of the following cell types is also typically abundant in Langerhans Cell Histiocytosis lesions, as described histologically?

• A) Neutrophils
• B) Basophils
• C) Macrophages
• D) Plasma cells
• E) Lymphocytes

Question 7

A 4-year-old boy is diagnosed with Langerhans Cell Histiocytosis affecting his skull. His parents inquire about the typical age range for this condition. Based on the provided clinical information, which statement best describes the age distribution of LCH?

• A) LCH exclusively affects infants under 1 year of age.
• B) LCH is most commonly seen in adults over 50.
• C) LCH can affect a variety of ages, but most patients are under age 30.
• D) LCH is primarily a disease of adolescents between 13 and 18 years old.
• E) LCH has an equal incidence across all age groups.

Question 8

A 25-year-old male presents with a painful, enlarging mass in his left femur. Radiographs show a lytic lesion. A biopsy is performed, and the pathology report describes a lesion composed of histiocytes, plasma cells, and numerous eosinophils. What is the characteristic nuclear feature of the Langerhans cells often observed in these lesions?

• A) Spindle-shaped nucleus
• B) Multiple small nuclei
• C) Indented nucleus
• D) Peripheral chromatin condensation
• E) Prominent central nucleolus

Question 9

A 6-year-old boy presents with a painful swelling in his skull, confirmed to be Langerhans Cell Histiocytosis. His parents ask about the origin of this condition. Based on the provided information, LCH is classified as which type of condition?

• A) A primary bone tumor
• B) A metabolic bone disease
• C) A hematopoietic condition
• D) A congenital malformation
• E) An autoimmune disorder

Question 10

A 1-year-old infant is found to have an enlarging skull lesion. Clinical examination reveals a soft, palpable mass. Radiographs show a lytic defect in the skull. A biopsy is performed, confirming Langerhans Cell Histiocytosis. What is the most common clinical finding associated with LCH lesions?

• A) Fever and weight loss
• B) Pathological fracture
• C) Pain and swelling of the involved bone
• D) Skin rash and lymphadenopathy
• E) Visual disturbances

Question 11

A 14-year-old male presents with a several-week history of a tender, enlarging area on his forehead. Clinically, there is a noticeable enlargement of the skull in the affected region. Imaging confirms a destructive lesion. A biopsy is planned for suspected Langerhans Cell Histiocytosis. What does the clinical photograph of a skull lesion in LCH typically demonstrate?

• A) Skin discoloration
• B) Visible pulsation
• C) Enlargement of the skull
• D) Multiple small nodules
• E) Ulceration of the overlying skin

Question 12

A 9-year-old girl presents with a painful lump on her back. Radiographs reveal a lytic lesion in a rib. A biopsy confirms Langerhans Cell Histiocytosis. Besides the skull, femur, and ilium, which other bone is specifically mentioned as a predilection site for LCH?

• A) Humerus
• B) Tibia
• C) Fibula
• D) Ribs
• E) Clavicle

Question 13

A 2-year-old male presents with a painful, enlarging mass on his scalp. Radiographs show a destructive lesion in the parietal bone. A biopsy is performed, and the pathologist identifies numerous eosinophils and cells with indented nuclei. What is the primary cell type that gives Langerhans Cell Histiocytosis its name and is characterized by these indented nuclei?

• A) Eosinophils
• B) Plasma cells
• C) Histiocytes
• D) Lymphocytes
• E) Neutrophils

Question 14

A 17-year-old female is diagnosed with Langerhans Cell Histiocytosis after presenting with a painful lesion in her ilium. Her physician is reviewing the potential systemic manifestations of LCH. Which of the following statements accurately describes the typical presentation of LCH lesions regarding symptoms?

• A) LCH lesions are predominantly asymptomatic.
• B) LCH lesions are often discovered incidentally during imaging for unrelated conditions.
• C) LCH lesions are typically symptomatic, causing pain and swelling.
• D) LCH lesions are characterized by systemic fever without local symptoms.
• E) LCH lesions primarily cause neurological deficits.

Question 15

A 28-year-old male presents with a new onset of polyuria and polydipsia, along with a painful lesion in his skull. Imaging confirms a destructive lesion, and a biopsy reveals Langerhans Cell Histiocytosis. The patient's endocrine symptoms are consistent with diabetes insipidus. This systemic complication is a result of LCH affecting which part of the body?

• A) Thyroid gland
• B) Adrenal glands
• C) Pituitary gland/hypothalamus
• D) Pancreas
• E) Parathyroid glands

Question 16

A 5-year-old boy presents with a painful swelling over his left parietal bone. Radiographs show a lytic lesion. A biopsy is performed, and the histological findings include a mixed inflammatory infiltrate with numerous eosinophils. Which of the following statements regarding the eosinophil presence in LCH lesions is accurate?

• A) Eosinophils are rarely seen in LCH lesions.
• B) Eosinophils are the only inflammatory cells present in LCH lesions.
• C) Many eosinophils may be present in LCH lesions.
• D) Eosinophils are primarily responsible for the destructive bone changes.
• E) Eosinophils indicate a bacterial infection.

Question 17

A 19-year-old male presents with a painful, enlarging mass in his right femur. Imaging reveals a lytic lesion. A biopsy confirms Langerhans Cell Histiocytosis. Given the hematopoietic nature of LCH, which of the following best describes its origin?

• A) Arises from mature osteocytes
• B) Originates from mesenchymal stem cells
• C) Derived from cells of the blood-forming system
• D) Develops from neural crest cells
• E) Forms from epithelial cells

Question 18

A 10-year-old female presents with a several-month history of a painful, palpable mass on her left rib. Radiographs show a lytic lesion. A biopsy is performed, confirming Langerhans Cell Histiocytosis. Which of the following statements accurately reflects the typical presentation of LCH in terms of symptom onset?

• A) LCH lesions are typically discovered incidentally during routine check-ups.
• B) LCH lesions are usually asymptomatic until they cause a pathological fracture.
• C) LCH lesions commonly present with pain and swelling, making them symptomatic.
• D) LCH lesions are often associated with systemic symptoms like fever and rash before local bone pain.
• E) LCH lesions are typically found in patients with known immunodeficiency.

Question 19

A 14-year-old female presents with a 3-month history of progressive pain and swelling in her proximal tibia. Physical examination reveals localized tenderness and mild warmth. Radiographs show an expansile lytic lesion in the metaphysis.

• A) First decade of life
• B) First two decades of life
• C) Third decade of life
• D) Fourth decade of life
• E) Fifth decade of life

Question 20

A 10-year-old male presents to the clinic with a chief complaint of persistent pain in his distal femur, which has been worsening over the past several weeks. He also notes some swelling in the area. Physical examination confirms local tenderness and palpable swelling.

• A) Fever and chills
• B) Weight loss and night sweats
• C) Pathological fracture
• D) Pain and swelling
• E) Joint stiffness without pain

Question 21

During surgical curettage of an expansile lesion in the proximal humerus of a 16-year-old patient, the surgeon encounters tissue within the bone cavity. The image below shows the typical gross appearance of this tissue.

• A) Solid white cartilaginous mass
• B) Clear serous fluid with smooth walls
• C) Brownish to hemorrhagic tissue with intralesional septations
• D) Yellowish fatty tissue with a fibrous capsule
• E) Purulent material with necrotic bone fragments

Question 22

A biopsy is performed on a 12-year-old girl with an expansile lytic lesion in her distal femur. The photomicrograph below shows the characteristic histological features of the lesion.

• A) Chondrocytes in a hyaline matrix
• B) Spindle cells with a storiform pattern
• C) Blood-filled cystic spaces with lining and giant cells
• D) Sheets of small round blue cells
• E) Lipid-laden macrophages

Question 23

A 15-year-old male presents with progressive pain and swelling in his distal femur. Radiographs show an expansile lytic lesion. Based on the description, an aneurysmal bone cyst is best characterized as:

• A) Malignant primary bone tumor
• B) Benign, locally aggressive tumor
• C) Metastatic lesion
• D) Infectious process
• E) Metabolic bone disease

Question 24

A 13-year-old patient undergoes curettage for an aneurysmal bone cyst in the proximal tibia. The surgeon is discussing the prognosis and potential for recurrence with the patient's parents.

• A) Less than 5%
• B) 5-10%
• C) 10-20%
• D) 20-50%
• E) Greater than 70%

Question 25

A 17-year-old female with a known history of fibrous dysplasia in her proximal femur presents with new onset pain and swelling. An MRI is performed, revealing fluid-fluid levels within the lesion, as shown in the image below.

• A) Osteosarcoma
• B) Ewing sarcoma
• C) Fibrous dysplasia
• D) Osteochondroma
• E) Enchondroma

Question 26

A 12-year-old boy presents with pain in his distal tibia. An MRI is ordered to further characterize an expansile lytic lesion seen on radiographs. The image below shows a characteristic finding on the MRI.

• A) Solid enhancement throughout the lesion
• B) Diffuse cortical thickening
• C) Fluid-fluid levels
• D) Periosteal sunburst reaction
• E) Extensive soft tissue calcifications

Question 27

A 14-year-old female is diagnosed with an aneurysmal bone cyst. Her physician explains that ABCs can sometimes arise as a secondary phenomenon from other underlying bone lesions.

• A) Giant cell tumor
• B) Fibrous dysplasia
• C) Chondroblastoma
• D) Osteosarcoma
• E) Non-ossifying fibroma

Question 28

A 16-year-old patient presents with a painful, expansile lesion in her distal femur. After diagnostic workup, she is diagnosed with an aneurysmal bone cyst. When discussing the epidemiology of this condition, the physician notes a slight predilection for a particular gender.

• A) Males
• B) Females
• C) Equal incidence in males and females
• D) Varies significantly by skeletal location
• E) No known gender predilection

Question 29

A surgeon is performing an intraoperative procedure for an aneurysmal bone cyst in the lower extremity of a 15-year-old patient. The image below shows the typical appearance of the lesion during surgery.

• A) A solid, white, cartilaginous mass
• B) A clear, synovial fluid-filled sac
• C) Multiple septations and blood-filled spaces
• D) Purulent material and necrotic bone
• E) Dense, sclerotic bone with minimal vascularity

Question 30

A pathologist receives a tissue specimen from an excised aneurysmal bone cyst. The image below shows the typical characteristics of the tissue.

• A) Firm and yellowish
• B) Gritty and white
• C) Friable and brownish-red
• D) Gelatinous and clear
• E) Hard and sclerotic

Question 31

A 10-year-old boy presents with a 2-month history of pain and swelling in his distal radius. On physical examination, the physician notes localized findings related to the suspected aneurysmal bone cyst.

• A) Generalized fever and malaise
• B) Skin rash over the affected area
• C) Local tenderness, swelling, and limited range of motion
• D) Significant muscle atrophy of the limb
• E) Distant lymphadenopathy

Question 32

Histological examination of an aneurysmal bone cyst reveals numerous blood-filled cystic spaces. The text notes that these spaces have a "lining."

• A) Are typically filled with pus
• B) Are lined by malignant cells
• C) Contain necrotic bone fragments
• D) Are lined by fibrous tissue and often contain giant cells
• E) Are filled with clear synovial fluid

Question 33

A 16-year-old male undergoes curettage for a large aneurysmal bone cyst in his proximal tibia. Given the high recurrence rate associated with curettage alone, the surgeon considers an adjuvant treatment to reduce the risk of recurrence.

• A) Simple observation without further intervention
• B) External beam radiation therapy as a primary treatment
• C) Intralesional sclerotherapy with agents like polidocanol
• D) Amputation of the affected limb
• E) Systemic chemotherapy

Question 34

A 15-year-old male presents with progressive pain and swelling in his distal femur. Radiographs show an expansile lytic lesion. Based on the description, an aneurysmal bone cyst is best characterized as:

• A) Malignant and metastatic
• B) Benign and non-aggressive
• C) Benign and locally aggressive

• Question 34

  A 14-year-old female presents with a 3-month history of progressive pain and swelling in her distal femur. Physical examination reveals local tenderness and limited range of motion. Radiographs show an expansile lytic lesion in the metaphysis. Given the typical demographic for aneurysmal bone cyst, what is the most common age range for presentation?

  • A) First decade of life
  • B) First two decades of life
  • C) Third decade of life
  • D) Fourth decade of life
  • E) Fifth decade of life and beyond

  View Answer & Explanation

  Correct Answer: B

  Rationale: Aneurysmal bone cysts usually occur in the first two decades of life. This demographic information is a key characteristic of the lesion. Main Distractor: Option A (First decade of life) is too narrow; while it can occur, the text specifies "first two decades," making it a less complete answer.

  Question 34

  A 12-year-old male presents with a 6-week history of worsening pain in his proximal humerus. He denies any trauma. On examination, there is palpable swelling and tenderness over the affected area. Radiographs demonstrate an expansile, lytic lesion. What is the most common presenting symptom for an aneurysmal bone cyst?

  • A) Pathologic fracture
  • B) Fever and chills
  • C) Pain and swelling
  • D) Neurological deficit
  • E) Asymptomatic incidental finding

  View Answer & Explanation

  Correct Answer: C

  Rationale: Patients with aneurysmal bone cysts typically present with pain and swelling of the involved area, as stated in the clinical context. Main Distractor: Option A (Pathologic fracture) can occur but is not described as the *typical* or *most common* presenting symptom in the provided text, which emphasizes pain and swelling.

  Question 34

  During surgical curettage of an expansile lesion in the tibia of a 16-year-old female, the surgeon encounters friable tissue within cystic spaces. Based on the gross appearance described for aneurysmal bone cysts, what color would the tissue most likely be?

  

  • A) White and cartilaginous
  • B) Yellow and fatty
  • C) Brownish to hemorrhagic
  • D) Gray and necrotic
  • E) Green and purulent

  View Answer & Explanation

  Correct Answer: C

  Rationale: The clinical context and Fig. 11.12 a, b state that aneurysmal bone cyst tissue can range in color from brownish to more hemorrhagic. Fig. 11.13 further describes it as usually friable and brownish-red. Main Distractor: Option A (White and cartilaginous) describes tissue more typical of cartilaginous tumors, not ABC.

  Question 34

  A biopsy is performed on a lytic lesion in the spine of a 10-year-old boy. The pathologist describes blood-filled cystic spaces with lining and the presence of giant cells. Which of the following histological features is characteristic of an aneurysmal bone cyst?

  

  • A) Nests of chondrocytes
  • B) Spindle cells with storiform pattern
  • C) Blood-filled cystic spaces with giant cells
  • D) Sheets of small round blue cells
  • E) Mature lamellar bone with fibrous stroma

  View Answer & Explanation

  Correct Answer: C

  Rationale: Fig. 11.14 a, b and its description explicitly state that photomicrographs show blood-filled cystic spaces with lining, and giant cells are often present, which are hallmark histological features of an aneurysmal bone cyst. Main Distractor: Option E (Mature lamellar bone with fibrous stroma) describes fibrous dysplasia or other benign bone lesions, not ABC.

  Question 34

  A 15-year-old female undergoes curettage for a large aneurysmal bone cyst in her distal radius. She is concerned about the possibility of the lesion returning. What is the reported recurrence rate following curettage for aneurysmal bone cysts?

  • A) Less than 5%
  • B) 5-10%
  • C) 10-20%
  • D) 20-50%
  • E) Greater than 75%

  View Answer & Explanation

  Correct Answer: D

  Rationale: The clinical context explicitly states that aneurysmal bone cysts tend to recur in a high percentage following curettage (20–50%). Main Distractor: Option C (10-20%) is lower than the stated range, underestimating the significant recurrence risk.

  Question 34

  A 13-year-old boy presents with a lytic lesion in his proximal femur. MRI reveals fluid levels within the lesion, and a previous biopsy showed features consistent with fibrous dysplasia. Which of the following conditions is known to develop a secondary aneurysmal bone cyst?

  

  • A) Osteosarcoma
  • B) Ewing sarcoma
  • C) Fibrous dysplasia
  • D) Osteochondroma
  • E) Enchondroma

  View Answer & Explanation

  Correct Answer: C

  Rationale: The clinical context and Fig. 11.11 a, b specifically mention that aneurysmal bone cysts can occur as secondary phenomena in other conditions such as giant cell tumor, fibrous dysplasia, and chondroblastoma. Main Distractor: Option A (Osteosarcoma) is a malignant tumor and is not listed as a condition that develops secondary ABC.

  Question 34

  A 17-year-old female presents with pain and swelling in her distal tibia. Radiographs show an expansile lytic lesion. An MRI is ordered to further characterize the lesion. What specific MRI finding is often associated with aneurysmal bone cysts, particularly secondary ones?

  

  • A) Solid enhancement with contrast
  • B) Cortical thickening
  • C) Fluid levels
  • D) Periosteal reaction (Codman's triangle)
  • E) Intralesional fat

  View Answer & Explanation

  Correct Answer: C

  Rationale: Fig. 11.11 b explicitly states that "The MRI shows the fluid levels of the components of secondary aneurysmal bone cyst." Fluid levels are a classic MRI finding for ABCs. Main Distractor: Option A (Solid enhancement with contrast) is a non-specific finding and not the most characteristic for ABC compared to fluid levels.

  Question 34

  A 9-year-old boy is diagnosed with an aneurysmal bone cyst in his calcaneus. His parents are concerned about the nature of the lesion. How is an aneurysmal bone cyst best characterized biologically?

  • A) Malignant, highly aggressive
  • B) Benign, non-aggressive
  • C) Benign, locally aggressive
  • D) Pre-malignant, low-grade
  • E) Metastatic, secondary lesion

  View Answer & Explanation

  Correct Answer: C

  Rationale: The clinical context defines aneurysmal bone cysts as "benign, locally aggressive cystic lesions." Main Distractor: Option B (Benign, non-aggressive) is incorrect because ABCs are specifically described as "locally aggressive," which implies a potential for local destruction and recurrence.

  Question 34

  A 16-year-old patient presents with symptoms suggestive of an aneurysmal bone cyst. When discussing the epidemiology of this condition, which gender is slightly more commonly affected?

  • A) Males
  • B) Females
  • C) Equal incidence in both genders
  • D) Predominantly in infants, regardless of gender
  • E) Predominantly in elderly, regardless of gender

  View Answer & Explanation

  Correct Answer: B

  Rationale: The clinical context states that aneurysmal bone cysts "are slightly more common in women." Main Distractor: Option A (Males) is incorrect as the text specifies a slight female predilection.

  Question 34

  During an intraoperative procedure for an aneurysmal bone cyst in the lower extremity of a 14-year-old, the surgeon notes specific features within the lesion. What characteristic intraoperative finding is typically observed in an aneurysmal bone cyst?

  

  • A) Solid, firm, white tumor mass
  • B) Multiple septations and blood-filled spaces
  • C) Purulent material and necrotic bone
  • D) Clear, serous fluid without septations
  • E) Chalky white, gritty material

  View Answer & Explanation

  Correct Answer: B

  Rationale: Fig. 11.15 b, an intraoperative photo, explicitly shows "multiple septations and blood-filled spaces," which is a classic finding for ABC. Fig. 11.12 also notes intralesional septations. Main Distractor: Option D (Clear, serous fluid without septations) describes a simple bone cyst, which is distinct from an ABC.

  Question 34

  A 10-year-old girl undergoes biopsy for an expansile lesion in her proximal tibia. Histological examination reveals blood-filled cystic spaces lined by fibrous tissue, with numerous multinucleated giant cells scattered throughout the stroma. The presence of giant cells in this context necessitates differentiation from which other bone lesion often associated with secondary ABC?

  

  • A) Osteoid osteoma
  • B) Enchondroma
  • C) Giant cell tumor
  • D) Osteomyelitis
  • E) Chondrosarcoma

  View Answer & Explanation

  Correct Answer: C

  Rationale: The clinical context states that aneurysmal bone cysts can occur as secondary phenomena in conditions such as giant cell tumor. Both ABC and giant cell tumor contain giant cells, making differentiation important, especially when considering secondary ABC. Main Distractor: Option B (Enchondroma) is a cartilaginous tumor and typically does not feature prominent giant cells in a way that would cause confusion with ABC or GCT.

  Question 34

  A 12-year-old boy presents with recurrent pain and swelling at the site of a previously treated aneurysmal bone cyst in his femur. He has undergone two prior curettages. What does the presence of multiple surgical scars, as shown in the clinical image, suggest about the management of ABCs?

  

  • A) ABCs rarely require surgical intervention.
  • B) Single curettage is usually curative for ABCs.
  • C) ABCs have a high propensity for recurrence, often requiring repeat procedures.
  • D) Surgical treatment is typically reserved for malignant transformation.
  • E) Non-operative management is the primary treatment for recurrent ABCs.

  View Answer & Explanation

  Correct Answer: C

  Rationale: Fig. 11.15 a shows "scars from prior surgery for recurrences," and the text states a high recurrence rate (20-50%) following curettage. This strongly implies that ABCs often recur and may require repeat surgical interventions. Main Distractor: Option B (Single curettage is usually curative for ABCs) directly contradicts the information provided about high recurrence rates and the image showing scars from prior recurrences.

  Question 34

  A 13-year-old girl complains of pain in her wrist for several months. On physical examination, the orthopaedic surgeon notes swelling and tenderness over the distal radius, and the patient has difficulty with wrist flexion. Which of the following physical findings is consistent with an aneurysmal bone cyst?

  • A) Warmth and erythema without tenderness
  • B) Generalized muscle atrophy
  • C) Local tenderness, swelling, and limited range of motion
  • D) Distant lymphadenopathy
  • E) Joint instability

  View Answer & Explanation

  Correct Answer: C

  Rationale: The clinical context states that "Physical findings include local tenderness, swelling, and limited range of motion" for aneurysmal bone cysts. Main Distractor: Option A (Warmth and erythema without tenderness) is less specific and doesn't include tenderness, which is a key finding.

  Question 34

  A 15-year-old male presents with a lytic lesion in his proximal femur, which on MRI shows fluid levels. This lesion is identified as a secondary aneurysmal bone cyst arising from fibrous dysplasia. What is a key characteristic of the underlying fibrous dysplasia that can lead to secondary ABC formation?

  

  • A) Its highly malignant potential
  • B) Its cartilaginous matrix
  • C) Its benign nature and potential for cystic degeneration
  • D) Its rapid growth and metastatic spread
  • E) Its association with osteochondromas

  View Answer & Explanation

  Correct Answer: C

  Rationale: The text states that fibrous dysplasia can develop secondary aneurysmal bone cyst. Fibrous dysplasia itself is a benign bone lesion, and the development of a secondary ABC implies a process of cystic degeneration or hemorrhage within the primary lesion. Main Distractor: Option A (Its highly malignant potential) is incorrect; fibrous dysplasia is a benign condition, not malignant.

  Question 34

  A 10-year-old girl is diagnosed with an aneurysmal bone cyst. Her physician is reviewing the possibility of it being a secondary lesion. Which of the following conditions is NOT listed as one that can develop a secondary aneurysmal bone cyst?

  • A) Giant cell tumor
  • B) Fibrous dysplasia
  • C) Chondroblastoma
  • D) Osteosarcoma
  • E) None of the above (all are listed)

  View Answer & Explanation

  Correct Answer: D

  Rationale: The clinical context lists giant cell tumor, fibrous dysplasia, and chondroblastoma as conditions that can develop secondary aneurysmal bone cysts. Osteosarcoma is not mentioned in this list. Main Distractor: Option E (None of the above) is incorrect because Osteosarcoma is indeed not listed as an associated condition for secondary ABC.

  Question 34

  A 14-year-old boy undergoes a biopsy of an expansile lesion in his proximal tibia. The pathologist notes that the lesion consists of numerous cystic spaces. What is the primary content typically found within these cystic spaces in an aneurysmal bone cyst?

  

  • A) Serous fluid
  • B) Cartilaginous matrix
  • C) Blood
  • D) Purulent exudate
  • E) Necrotic debris

  View Answer & Explanation

  Correct Answer: C

  Rationale: The term "aneurysmal" implies vascular involvement, and the histological description (Fig. 11.14) and gross appearance (Fig. 11.15) explicitly mention "blood-filled cystic spaces" and "hemorrhagic" tissue. Main Distractor: Option A (Serous fluid) is characteristic of a simple bone cyst, not an aneurysmal bone cyst.

  Question 34

  During surgical exploration of an aneurysmal bone cyst in a 17-year-old patient, the surgeon attempts to debride the lesion. What is the typical consistency of the tissue encountered within an aneurysmal bone cyst?

  

  • A) Hard and sclerotic
  • B) Rubbery and elastic
  • C) Friable and brownish-red
  • D) Gelatinous and clear
  • E) Gritty and calcified

  View Answer & Explanation

  Correct Answer: C

  Rationale: Fig. 11.13 explicitly states, "Tissue from within an aneurysmal bone cyst is usually friable and brownish-red in color." Main Distractor: Option A (Hard and sclerotic) describes dense bone or certain benign tumors like osteomas, which is contrary to the cystic, hemorrhagic nature of ABC.

  Question 34

  A 12-year-old female presents with a lytic lesion in her proximal humerus. MRI demonstrates multiple fluid-fluid levels within the lesion. This specific MRI finding is highly suggestive of what characteristic feature of an aneurysmal bone cyst?

  

  • A) Intralesional calcification
  • B) Active bone formation
  • C) Hemorrhage and serous fluid layering
  • D) Cartilaginous differentiation
  • E) Malignant transformation

  View Answer & Explanation

  Correct Answer: C

  Rationale: Fluid levels on MRI (as shown in Fig. 11.11 b) are a classic sign of aneurysmal bone cysts, representing the layering of blood products (serum and red blood cells) within the cystic spaces due to gravity. Main Distractor: Option A (Intralesional calcification) is not the primary interpretation of fluid levels; calcification would appear as signal void or specific patterns on different sequences.

  Question 34

  A 16-year-old male undergoes open biopsy for an expansile lesion in his distal femur. Upon opening the lesion, the surgeon observes multiple internal divisions within the cystic cavity. What is this gross pathological feature called?

  

  • A) Trabeculation
  • B) Septations
  • C) Pseudocapsule
  • D) Necrosis
  • E) Sclerosis

  View Answer & Explanation

  Correct Answer: B

  Rationale: Fig. 11.12 a, b and Fig. 11.15 b both explicitly mention and show "intralesional septations" and "multiple septations" as a characteristic gross finding of aneurysmal bone cysts. Main Distractor: Option A (Trabeculation) refers to the internal bony architecture, which is different from the fibrous divisions within the cystic spaces of an ABC.

  Question 34

  A 10-year-old girl is diagnosed with an aneurysmal bone cyst in her sacrum. Her parents are concerned about the potential for the lesion to spread or cause significant damage. Based on the provided description, what is the most accurate characterization of the biological behavior of an aneurysmal bone cyst?

  • A) Malignant with high metastatic potential
  • B) Benign but locally aggressive
  • C) Benign and self-limiting
  • D) Low-grade malignant with local invasion only
  • E) Pre-malignant lesion requiring immediate radical resection

  View Answer & Explanation

  Correct Answer: B

  Rationale: The clinical context clearly states, "Aneurysmal bone cysts are benign, locally aggressive cystic lesions." This accurately describes their biological behavior. Main Distractor: Option C (Benign and self-limiting) is incorrect because while benign, they are "locally aggressive" and have a high recurrence rate, indicating they are not typically self-limiting without intervention.

Question 35

A 14-year-old female presents with a 3-month history of progressive pain and swelling in her distal femur. Physical examination reveals local tenderness and limited range of motion. Radiographs show an expansile lytic lesion in the metaphysis. Given the typical demographic for aneurysmal bone cyst, what is the most common age range for presentation?

• A) First decade of life
• B) First two decades of life
• C) Third decade of life
• D) Fourth decade of life
• E) Fifth decade of life and beyond

Question 36

A 12-year-old male presents with a 6-week history of worsening pain in his proximal humerus. He denies any trauma. On examination, there is palpable swelling and tenderness over the affected area. Radiographs demonstrate an expansile, lytic lesion. What is the most common presenting symptom for an aneurysmal bone cyst?

• A) Pathologic fracture
• B) Fever and chills
• C) Pain and swelling
• D) Neurological deficit
• E) Asymptomatic incidental finding

Question 37

During surgical curettage of an expansile lesion in the tibia of a 16-year-old female, the surgeon encounters friable tissue within cystic spaces. Based on the gross appearance described for aneurysmal bone cysts, what color would the tissue most likely be?

• A) White and cartilaginous
• B) Yellow and fatty
• C) Brownish to hemorrhagic
• D) Gray and necrotic
• E) Green and purulent

Question 38

A biopsy is performed on a lytic lesion in the spine of a 10-year-old boy. The pathologist describes blood-filled cystic spaces with lining and the presence of giant cells. Which of the following histological features is characteristic of an aneurysmal bone cyst?

• A) Nests of chondrocytes
• B) Spindle cells with storiform pattern
• C) Blood-filled cystic spaces with giant cells
• D) Sheets of small round blue cells
• E) Mature lamellar bone with fibrous stroma

Question 39

A 15-year-old female undergoes curettage for a large aneurysmal bone cyst in her distal radius. She is concerned about the possibility of the lesion returning. What is the reported recurrence rate following curettage for aneurysmal bone cysts?

• A) Less than 5%
• B) 5-10%
• C) 10-20%
• D) 20-50%
• E) Greater than 75%

Question 40

A 13-year-old boy presents with a lytic lesion in his proximal femur. MRI reveals fluid levels within the lesion, and a previous biopsy showed features consistent with fibrous dysplasia. Which of the following conditions is known to develop a secondary aneurysmal bone cyst?

• A) Osteosarcoma
• B) Ewing sarcoma
• C) Fibrous dysplasia
• D) Osteochondroma
• E) Enchondroma

Question 41

A 17-year-old female presents with pain and swelling in her distal tibia. Radiographs show an expansile lytic lesion. An MRI is ordered to further characterize the lesion. What specific MRI finding is often associated with aneurysmal bone cysts, particularly secondary ones?

• A) Solid enhancement with contrast
• B) Cortical thickening
• C) Fluid levels
• D) Periosteal reaction (Codman's triangle)
• E) Intralesional fat

Question 42

A 9-year-old boy is diagnosed with an aneurysmal bone cyst in his calcaneus. His parents are concerned about the nature of the lesion. How is an aneurysmal bone cyst best characterized biologically?

• A) Malignant, highly aggressive
• B) Benign, non-aggressive
• C) Benign, locally aggressive
• D) Pre-malignant, low-grade
• E) Metastatic, secondary lesion

Question 43

A 16-year-old patient presents with symptoms suggestive of an aneurysmal bone cyst. When discussing the epidemiology of this condition, which gender is slightly more commonly affected?

• A) Males
• B) Females
• C) Equal incidence in both genders
• D) Predominantly in infants, regardless of gender
• E) Predominantly in elderly, regardless of gender

Question 44

During an intraoperative procedure for an aneurysmal bone cyst in the lower extremity of a 14-year-old, the surgeon notes specific features within the lesion. What characteristic intraoperative finding is typically observed in an aneurysmal bone cyst?

• A) Solid, firm, white tumor mass
• B) Multiple septations and blood-filled spaces
• C) Purulent material and necrotic bone
• D) Clear, serous fluid without septations
• E) Chalky white, gritty material

Question 45

A 10-year-old girl undergoes biopsy for an expansile lesion in her proximal tibia. Histological examination reveals blood-filled cystic spaces lined by fibrous tissue, with numerous multinucleated giant cells scattered throughout the stroma. The presence of giant cells in this context necessitates differentiation from which other bone lesion often associated with secondary ABC?

• A) Osteoid osteoma
• B) Enchondroma
• C) Giant cell tumor
• D) Osteomyelitis
• E) Chondrosarcoma

Question 46

A 12-year-old boy presents with recurrent pain and swelling at the site of a previously treated aneurysmal bone cyst in his femur. He has undergone two prior curettages. What does the presence of multiple surgical scars, as shown in the clinical image, suggest about the management of ABCs?

• A) ABCs rarely require surgical intervention.
• B) Single curettage is usually curative for ABCs.
• C) ABCs have a high propensity for recurrence, often requiring repeat procedures.
• D) Surgical treatment is typically reserved for malignant transformation.
• E) Non-operative management is the primary treatment for recurrent ABCs.

Question 47

A 13-year-old girl complains of pain in her wrist for several months. On physical examination, the orthopaedic surgeon notes swelling and tenderness over the distal radius, and the patient has difficulty with wrist flexion. Which of the following physical findings is consistent with an aneurysmal bone cyst?

• A) Warmth and erythema without tenderness
• B) Generalized muscle atrophy
• C) Local tenderness, swelling, and limited range of motion
• D) Distant lymphadenopathy
• E) Joint instability

Question 48

A 15-year-old male presents with a lytic lesion in his proximal femur, which on MRI shows fluid levels. This lesion is identified as a secondary aneurysmal bone cyst arising from fibrous dysplasia. What is a key characteristic of the underlying fibrous dysplasia that can lead to secondary ABC formation?

• A) Its highly malignant potential
• B) Its cartilaginous matrix
• C) Its benign nature and potential for cystic degeneration
• D) Its rapid growth and metastatic spread
• E) Its association with osteochondromas

Question 49

A 10-year-old girl is diagnosed with an aneurysmal bone cyst. Her physician is reviewing the possibility of it being a secondary lesion. Which of the following conditions is NOT listed as one that can develop a secondary aneurysmal bone cyst?

• A) Giant cell tumor
• B) Fibrous dysplasia
• C) Chondroblastoma
• D) Osteosarcoma
• E) None of the above (all are listed)

Question 50

A 14-year-old boy undergoes a biopsy of an expansile lesion in his proximal tibia. The pathologist notes that the lesion consists of numerous cystic spaces. What is the primary content typically found within these cystic spaces in an aneurysmal bone cyst?

• A) Serous fluid
• B) Cartilaginous matrix
• C) Blood
• D) Purulent exudate
• E) Necrotic debris

Question 51

During surgical exploration of an aneurysmal bone cyst in a 17-year-old patient, the surgeon attempts to debride the lesion. What is the typical consistency of the tissue encountered within an aneurysmal bone cyst?

• A) Hard and sclerotic
• B) Rubbery and elastic
• C) Friable and brownish-red
• D) Gelatinous and clear
• E) Gritty and calcified

Question 52

A 12-year-old female presents with a lytic lesion in her proximal humerus. MRI demonstrates multiple fluid-fluid levels within the lesion. This specific MRI finding is highly suggestive of what characteristic feature of an aneurysmal bone cyst?

• A) Intralesional calcification
• B) Active bone formation
• C) Hemorrhage and serous fluid layering
• D) Cartilaginous differentiation
• E) Malignant transformation

Question 53

A 16-year-old male undergoes open biopsy for an expansile lesion in his distal femur. Upon opening the lesion, the surgeon observes multiple internal divisions within the cystic cavity. What is this gross pathological feature called?

• A) Trabeculation
• B) Septations
• C) Pseudocapsule
• D) Necrosis
• E) Sclerosis

Question 54

A 7-year-old boy presents with bilateral knee pain, a waddling gait, and decreased range of motion in his hips and knees. Radiographs reveal irregular and fragmented epiphyses in the hips, knees, and ankles, with flat articular surfaces. The metaphyses appear normal, and there is mild shortening of the tubular bones. His height is within the lower range of normal for his age, with normal body proportions.

• A) Achondroplasia
• B) Spondyloepiphyseal Dysplasia
• C) Multiple Epiphyseal Dysplasia
• D) Pseudoachondroplasia
• E) Morquio Syndrome

Question 55

A 10-year-old girl is diagnosed with Multiple Epiphyseal Dysplasia after presenting with chronic hip and knee pain. Her parents are concerned about the risk of recurrence in future children and the genetic implications for her siblings. Which of the following is the most common mode of inheritance for this condition?

• A) Autosomal recessive
• B) X-linked dominant
• C) Autosomal dominant
• D) X-linked recessive
• E) Mitochondrial inheritance

Question 56

A 5-year-old boy presents with a history of a waddling gait and mild short stature. Radiographs show widespread epiphyseal irregularities and fragmentation. The underlying pathological disturbance in Multiple Epiphyseal Dysplasia primarily involves which of the following processes?

• A) Defective intramembranous ossification
• B) Disturbance of enchondral ossification
• C) Abnormal bone remodeling
• D) Primary osteoblast dysfunction
• E) Increased osteoclast activity

Question 57

A 9-year-old boy with a known diagnosis of Multiple Epiphyseal Dysplasia presents for a routine follow-up. His primary complaints are joint pain and limping. Based on the typical presentation of MED, which group of joints is most dominantly affected?

• A) Shoulders, elbows, wrists
• B) Hips, knees, ankles
• C) Spine, ribs, sternum
• D) Mandible, maxilla, skull base
• E) Small joints of the hands and feet only

Question 58

A 6-year-old girl presents with bilateral hip pain and a limping gait. Radiographs of her pelvis and lower extremities are obtained. Which of the following radiographic findings is most characteristic of Multiple Epiphyseal Dysplasia?

• A) Sclerotic metaphyses with widening growth plates
• B) Irregular, fragmented epiphyses and flat articular surfaces
• C) Shortened, bowed long bones with normal epiphyses
• D) Vertebral plana with anterior wedging
• E) Generalized osteopenia with pathological fractures

Question 59

A 12-year-old boy with a family history of Multiple Epiphyseal Dysplasia undergoes radiographic evaluation. His radiographs show typical epiphyseal abnormalities in his hips and knees. When evaluating the long bones, what is the expected appearance of the metaphyses in MED?

• A) Widened and splayed
• B) Irregular and sclerotic
• C) Normal
• D) Cupped and frayed
• E) Severely shortened and dense

Question 60

A 4-year-old girl is suspected of having Multiple Epiphyseal Dysplasia due to early onset joint pain and a waddling gait. Her parents are concerned about her growth. What is the typical presentation regarding height and body proportions in patients with MED?

• A) Severe disproportionate dwarfism with short limbs
• B) Normal or moderately short height with normal proportions
• C) Short trunk dwarfism with long limbs
• D) Progressive macrocephaly with normal height
• E) Tall stature with arachnodactyly

Question 61

A 15-year-old male presents with chronic knee pain and early degenerative changes on radiographs, which also show fragmented epiphyses and normal metaphyses. Given these findings, which of the following conditions would be the most important to differentiate from Multiple Epiphyseal Dysplasia, particularly considering the normal metaphyses?

• A) Achondroplasia
• B) Rickets
• C) Pseudoachondroplasia
• D) Mucopolysaccharidosis Type IV (Morquio Syndrome)
• E) Osteogenesis Imperfecta

Question 62

A 7-year-old boy diagnosed with Multiple Epiphyseal Dysplasia is noted to have hand deformities during a physical examination. Radiographs of his hands are obtained.

Based on the provided image (Fig. 1.4) and the typical presentation of MED, what is the characteristic finding in the fingers?

• A) Disproportionate lengthening of the metacarpals
• B) Equally shortened fingers
• C) Severe ulnar deviation of the digits
• D) Hypoplastic thumb with radial deviation
• E) Normal length with joint hypermobility

Question 63

A 10-year-old girl with Multiple Epiphyseal Dysplasia presents with foot pain and difficulty wearing shoes. Radiographs of her feet are obtained.

Based on the provided image (Fig. 1.5) and the typical presentation of MED, what is the characteristic finding in the toes?

• A) Uniformly elongated toes
• B) Absence of phalanges
• C) Variably shortened toes
• D) Severe hallux valgus deformity
• E) Normal length and alignment

Question 64

A 13-year-old boy with Multiple Epiphyseal Dysplasia complains of chronic anterior knee pain, especially with activity. A lateral radiograph of his knee is obtained.

Based on the provided image (Fig. 1.3) and the clinical context of MED, what specific radiographic finding is observed in the patella?

• A) Patella alta with trochlear hypoplasia
• B) Patella baja with a flattened femoral condyle
• C) Fragmentation and moderate deformity of the patella
• D) Complete absence of the patella (aplasia)
• E) Normal patellar size and shape

Question 65

A 6-year-old child is brought to the orthopedic clinic by parents who report that the child has been experiencing increasing difficulty with walking and occasional pain in the lower extremities. They also note a subtle change in gait. What is the most common initial complaint that leads to the diagnosis of Multiple Epiphyseal Dysplasia?

• A) Upper extremity weakness
• B) Spinal deformity
• C) Lower extremity joint pain with decreased range of motion and limping
• D) Recurrent fractures
• E) Craniofacial anomalies

Question 66

A 3-year-old presents with a waddling gait and mild bilateral hip pain. Radiographs show delayed and irregular ossification of the femoral heads and acetabular dysplasia. The metaphyses are normal. Given the nature of Multiple Epiphyseal Dysplasia, at what age range are symptoms most likely to become apparent and lead to diagnosis?

• A) Infancy (0-1 year)
• B) Early childhood (2-10 years)
• C) Adolescence (11-18 years)
• D) Early adulthood (19-30 years)
• E) Late adulthood (over 60 years)

Question 67

A 5-year-old boy presents with short stature, but his parents note that his trunk and limbs appear to be in proportion. He has a waddling gait and bilateral hip pain. Radiographs show irregular epiphyseal ossification and normal metaphyses. Which of the following features helps distinguish Multiple Epiphyseal Dysplasia from Achondroplasia?

• A) Presence of joint pain
• B) Normal body proportions
• C) Autosomal dominant inheritance
• D) Shortening of tubular bones
• E) Involvement of the lower extremities

Question 68

A 25-year-old woman with a history of Multiple Epiphyseal Dysplasia since childhood presents with severe, chronic hip and knee pain that significantly impacts her daily activities. Radiographs show advanced joint space narrowing, subchondral sclerosis, and osteophyte formation in both hips and knees. This clinical scenario is a common long-term complication of MED due to which underlying issue?

• A) Progressive osteonecrosis
• B) Recurrent septic arthritis
• C) Early onset osteoarthritis
• D) Pathological fractures
• E) Ligamentous instability

Question 69

A 4-year-old boy is diagnosed with Multiple Epiphyseal Dysplasia. His parents ask about the treatment options for his condition. What is the general principle of management for MED?

• A) Curative gene therapy
• B) Aggressive surgical correction of all deformities in early childhood
• C) Symptomatic and supportive care, with surgical intervention for severe deformities or pain
• D) Long-term growth hormone therapy
• E) Dietary modifications to improve bone mineralization

Question 70

A 14-year-old girl with Multiple Epiphyseal Dysplasia presents with increasing hip pain and a Trendelenburg gait. Radiographs of her hips show flattened and irregular femoral heads, with widening of the femoral neck and shallow acetabula. These findings are consistent with the epiphyseal involvement in MED, which often leads to what specific hip deformity?

• A) Slipped Capital Femoral Epiphysis (SCFE)
• B) Legg-Calvé-Perthes disease
• C) Coxa magna and coxa plana
• D) Developmental Dysplasia of the Hip (DDH)
• E) Femoroacetabular Impingement (FAI)

Question 71

A 8-year-old boy is diagnosed with Multiple Epiphyseal Dysplasia. His parents are concerned about his overall growth. While his height is moderately short, his body proportions are normal. What is the typical radiographic finding regarding the length of the tubular bones in MED?

• A) Significant lengthening
• B) Normal length
• C) Mild shortening
• D) Severe shortening with bowing
• E) Asymmetric shortening

Question 72

A 6-year-old girl presents with chronic bilateral knee pain and a waddling gait. Radiographs show irregular and fragmented epiphyses in her hips and knees, with normal metaphyses. Her parents are considering having more children and want to understand the genetic risk. What is the primary indication for genetic testing in this family?

• A) To confirm the diagnosis in the affected child
• B) To predict the severity of the disease
• C) To guide surgical treatment decisions
• D) To identify unaffected carriers for family planning and counseling
• E) To determine eligibility for growth hormone therapy

Question 73

A 9-year-old boy with Multiple Epiphyseal Dysplasia is followed longitudinally. Over several years, his joint pain and stiffness have progressively worsened, particularly in his hips and knees. This progressive nature of joint symptoms in MED is primarily due to:

• A) Continuous growth plate fusion
• B) Accumulation of metabolic waste products in the joints
• C) Ongoing abnormal development and premature degeneration of articular cartilage
• D) Increased bone density leading to stiffness
• E) Systemic inflammatory response

Question 74

A 7-year-old boy presents with chronic bilateral knee pain and a noticeable limp. Physical examination reveals decreased range of motion in both knees. Radiographs of the knee joints are obtained.

• A) Patellar dislocation
• B) Patellar fragmentation and moderate deformity
• C) Metaphyseal flaring
• D) Physeal widening
• E) Joint space narrowing without epiphyseal changes

Question 75

A 9-year-old girl is diagnosed with Multiple Epiphyseal Dysplasia after presenting with hip and knee pain and radiographic findings of irregular epiphyses. Her father and paternal grandfather also have a history of similar joint issues.

• A) Autosomal recessive
• B) X-linked dominant
• C) Autosomal dominant
• D) X-linked recessive
• E) Mitochondrial

Question 76

An 8-year-old boy presents with chronic joint pain and limping. Radiographs reveal irregular and fragmented epiphyses in multiple joints, with normal metaphyses. Genetic testing confirms a diagnosis of Multiple Epiphyseal Dysplasia.

• A) Intramembranous ossification
• B) Enchondral ossification
• C) Bone remodeling
• D) Osteoclast activity
• E) Periosteal bone formation

Question 77

A 6-year-old girl is evaluated for short stature and joint pain. Radiographs show irregular and flattened epiphyses in her hips and knees. Her overall height is moderately short, but her body proportions are normal.

• A) Epiphyseal morphology
• B) Articular surface contour
• C) Metaphyseal appearance
• D) Tubular bone length
• E) Patellar development

Question 78

An 8-year-old boy presents to the clinic with a 6-month history of worsening pain in his hips and knees, particularly after physical activity. His parents also note that he has started limping more frequently.

• A) Upper extremity weakness
• B) Spinal deformity
• C) Craniofacial anomalies
• D) Lower extremity joint pain
• E) Hearing loss

Question 79

A 10-year-old girl with a confirmed diagnosis of Multiple Epiphyseal Dysplasia reports pain and stiffness. On examination, she has limited movement in her hips, knees, and ankles. Radiographs show characteristic epiphyseal changes in these areas.

• A) Hips, knees, and ankles
• B) Shoulders and elbows
• C) Wrists and hands
• D) Sacroiliac joints
• E) Lumbar spine

Question 80

A 12-year-old boy with Multiple Epiphyseal Dysplasia presents for a follow-up. While his primary complaints are in his lower extremities, his parents also express concern about the appearance of his hands, which show some mild shortening of the fingers.

• A) Always severe with contractures
• B) Exclusively involves the shoulder
• C) Never affected
• D) May differ from minimal to severe with significant deformities
• E) Primarily characterized by muscle atrophy

Question 81

A 7-year-old girl is referred for evaluation of her height. Her parents are concerned she is shorter than her peers. On physical examination, her limbs appear proportionate to her trunk, and she has no obvious dysmorphic features.

• A) Severely short stature with disproportionate limbs
• B) Tall stature with arachnodactyly
• C) Normal or moderately short height with normal proportions
• D) Normal height with truncal shortening
• E) Short stature with macrocephaly

Question 82

A 9-year-old boy with Multiple Epiphyseal Dysplasia presents with joint pain. During the physical examination, the clinician observes that his fingers appear shorter than expected for his age.

• A) Variably shortened
• B) Equally shortened
• C) Elongated
• D) Normal length
• E) Only the thumb is shortened

Question 83

An 11-year-old girl with Multiple Epiphyseal Dysplasia complains of foot pain and difficulty wearing certain shoes. On examination, her toes appear shorter than average, but not uniformly so.

• A) Equally shortened
• B) Elongated
• C) Variably shortened
• D) Normal length
• E) Only the great toe is shortened

Question 84

A 6-year-old boy with a history of chronic hip pain undergoes radiography. The images reveal irregular epiphyseal ossification and a distinct alteration in the shape of the joint surfaces.

• A) Deepened articular surfaces
• B) Irregular joint space widening
• C) Subchondral cysts
• D) Flat articular surfaces
• E) Osteochondritis dissecans

Question 85

A 10-year-old girl is diagnosed with Multiple Epiphyseal Dysplasia. Her radiographs show not only epiphyseal abnormalities but also a mild reduction in the length of certain bones in her limbs.

• A) Flat bones
• B) Irregular bones
• C) Sesamoid bones
• D) Vertebrae
• E) Tubular bones

Question 86

A 7-year-old boy presents with a history of progressive difficulty walking and a noticeable alteration in his gait. His parents report that he often complains of discomfort in his legs after playing.

• A) Muscle atrophy
• B) Sensory deficits
• C) Skin discoloration
• D) Limping
• E) Bowel dysfunction

Question 87

A 9-year-old girl with Multiple Epiphyseal Dysplasia undergoes a physical examination. The orthopaedic surgeon assesses the mobility of her hip and knee joints, noting a consistent pattern of restriction.

• A) Joint hypermobility
• B) Warmth and erythema
• C) Decreased range of motion
• D) Crepitus without pain
• E) Muscle spasm

Question 88

A family presents with two children diagnosed with Multiple Epiphyseal Dysplasia. The younger child has mild hip pain and minimal radiographic changes, while the older sibling has severe knee and ankle deformities requiring surgical intervention.

• A) Uniform severity of deformities across all affected joints
• B) Deformities exclusively in the lower extremities
• C) Deformities that worsen rapidly with age
• D) Different levels of deformities may be present in one patient
• E) Deformities that are always symmetrical

Question 89

A 5-year-old boy presents with short stature and waddling gait. Radiographs show irregular and fragmented epiphyses, flat articular surfaces, and mild shortening of tubular bones. Crucially, the metaphyses appear normal.

• A) Metaphyseal dysplasias
• B) Spondyloepiphyseal dysplasias
• C) Diaphyseal dysplasias
• D) Craniosynostoses
• E) Osteopetrosis

Question 90

A 45-year-old male with a 10-year history of plaque psoriasis presents with insidious onset of pain and swelling in his right knee, left ankle, and the distal interphalangeal (DIP) joint of his left index finger. He also reports morning stiffness lasting over an hour. Physical examination reveals erythematous, scaly plaques on his elbows and scalp, pitting of several fingernails, and tenderness with effusion in the affected joints. Radiographs show erosions and new bone formation in the left DIP joint.

• A) Rheumatoid Arthritis
• B) Gout
• C) Osteoarthritis
• D) Psoriatic Arthritis
• E) Reactive Arthritis

Question 91

A 38-year-old female with a known history of psoriasis presents with a painful, swollen right middle finger that resembles a "sausage." She denies any recent trauma or infection. Her skin psoriasis is well-controlled with topical agents. On examination, the entire digit is diffusely swollen, erythematous, and tender to palpation. Radiographs show soft tissue swelling and early periostitis of the phalanges.

• A) Boutonnière deformity
• B) Swan neck deformity
• C) Dactylitis
• D) Heberden's node
• E) Podagra

Question 92

A 52-year-old male presents with chronic pain and stiffness in multiple joints, particularly his hands and feet. He has a long-standing history of skin lesions on his trunk and scalp. On examination, several of his fingernails show small indentations and separation from the nail bed. His joint examination reveals tenderness and swelling in the DIP joints of both hands.

• A) Systemic Lupus Erythematosus
• B) Rheumatoid Arthritis
• C) Psoriatic Arthritis
• D) Osteoarthritis
• E) Fungal Nail Infection

Question 93

A 60-year-old female with severe, long-standing psoriatic arthritis presents with significant deformity and functional impairment of her hands. Radiographs of her hands reveal marked osteolysis of the distal phalanges with telescoping of the digits, giving a characteristic appearance.

• A) Joint space narrowing
• B) Subchondral sclerosis
• C) Pencil-in-cup deformity
• D) Marginal erosions
• E) Periarticular osteopenia

Question 94

A 48-year-old male with a 15-year history of psoriasis presents with chronic pain and swelling in his right foot. Physical examination demonstrates tenderness along the Achilles tendon insertion and diffuse swelling of the toes. Radiographs of the foot demonstrate fluffy periostitis along the shafts of the metatarsals and phalanges, as well as new bone formation at the Achilles tendon insertion.

• A) Rheumatoid Arthritis
• B) Gout
• C) Osteoarthritis
• D) Psoriatic Arthritis
• E) Septic Arthritis

Question 95

A 55-year-old male with a history of psoriasis and peripheral arthritis complains of chronic low back pain and stiffness, particularly worse in the morning and improving with activity. He also reports alternating buttock pain. Physical examination reveals limited spinal mobility. Sacroiliac joint compression tests elicit pain. Radiographs of the pelvis show bilateral sacroiliitis with erosions and sclerosis.

• A) Rheumatoid Arthritis
• B) Osteoarthritis
• C) Ankylosing Spondylitis
• D) Septic Arthritis
• E) Diffuse Idiopathic Skeletal Hyperostosis (DISH)

Question 96

A 40-year-old female presents with symmetric polyarthritis affecting her metacarpophalangeal (MCP) and proximal interphalangeal (PIP) joints, as well as her wrists and knees. She has significant morning stiffness. Laboratory tests reveal an elevated ESR and CRP. However, her Rheumatoid Factor (RF) and anti-cyclic citrullinated peptide (anti-CCP) antibodies are negative. She also reports a history of a chronic skin rash on her elbows and scalp.

• A) Symmetric polyarthritis
• B) Elevated ESR and CRP
• C) Negative RF and anti-CCP antibodies
• D) Morning stiffness
• E) Involvement of MCP and PIP joints

Question 97

A 62-year-old male with a history of psoriasis presents with acute onset of severe pain, swelling, and erythema in his right great toe. He reports a similar episode in the past that resolved spontaneously. He denies any recent trauma. Physical examination reveals a hot, swollen, exquisitely tender first metatarsophalangeal (MTP) joint. Arthrocentesis is performed, and synovial fluid analysis shows inflammatory cells but no crystals. His serum uric acid level is normal.

• A) Septic Arthritis
• B) Pseudogout
• C) Psoriatic Arthritis flare
• D) Osteoarthritis
• E) Reactive Arthritis

Question 98

A 45-year-old male presents with a 6-month history of pain and swelling in his right index finger DIP joint and left knee. He also reports a scaly rash on his elbows and scalp. Physical examination reveals erythema and silvery scales on the extensor surfaces of his elbows and scalp, along with tenderness and swelling of the right index finger DIP joint and left knee effusion. Radiographs show erosions and new bone formation in the right index finger DIP joint. Which of the following is the most likely diagnosis?

• A) Rheumatoid Arthritis
• B) Gout
• C) Osteoarthritis
• D) Psoriatic Arthritis
• E) Reactive Arthritis

Question 99

A 38-year-old female with a known history of psoriasis presents with diffuse swelling and pain involving her entire left middle finger. The finger appears sausage-like, erythematous, and tender to palpation. Radiographs show soft tissue swelling and periostitis of the phalanges of the affected finger. This specific manifestation is best described as:

• A) Boutonnière deformity
• B) Swan neck deformity
• C) Dactylitis
• D) Tenosynovitis
• E) Mallet finger

Question 100

A 52-year-old male with psoriatic arthritis complains of changes in his fingernails. On examination, you observe pitting, onycholysis, and subungual hyperkeratosis. These nail changes are most commonly associated with which of the following conditions?

• A) Onychomycosis
• B) Rheumatoid arthritis
• C) Psoriatic arthritis
• D) Systemic lupus erythematosus
• E) Raynaud's phenomenon