Musculoskeletal Radiology — MCQs
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All are radiological signs of Vitamin C deficiency except:
Characteristic radiological feature of fibrous dysplasia is:
Popcorn calcification is seen in
Which of the following represents important radiological differentiating features between psoriatic arthritis, rheumatoid arthritis, and ankylosing spondylitis?
X-ray appearances of osteosarcoma are all except -
Radiographically, the lesion shown in the image could be:
What is the investigation of choice for diagnosing a stress fracture?
Dense cartilage matrix calcification is characteristically seen in
X-ray features of hypoparathyroidism are the following except:
All of the following have the same radiographic features except:
Musculoskeletal Radiology Indian Medical PG Practice Questions and MCQs
Question 291: All are radiological signs of Vitamin C deficiency except:
- A. White line of Fränkel
- B. Wimberger line
- C. Widening of epiphysis (Correct Answer)
- D. Osteoporosis of bone
Explanation: ***Widening of epiphysis*** - This is **NOT a radiological sign of Vitamin C deficiency (scurvy)**. - In scurvy, **epiphyseal-metaphyseal separation** or **slipped epiphyses** can occur due to weakened growth plates and subperiosteal hemorrhage, but the epiphysis itself does not show widening. - Scurvy is characterized by impaired collagen synthesis leading to fragility at the growth plate zone, resulting in displacement or separation, not widening. *White line of Fränkel* - This refers to a dense, **calcified metaphyseal line** seen on radiographs, characteristic of scurvy. - It represents the zone of provisional calcification, which appears prominent due to impaired endochondral ossification in **Vitamin C deficiency**. *Wimberger line (Wimberger's sign)* - Also known as Wimberger's ring sign, this describes a **sclerotic ring of increased density** around the **epiphyseal ossification centers**. - It is caused by **subperiosteal hemorrhage** and subsequent calcification, a classic radiological sign of scurvy. *Osteoporosis of bone* - **Generalized osteopenia** (ground-glass osteoporosis) is seen in scurvy due to impaired osteoid formation and defective collagen synthesis. - This leads to decreased bone density and increased skeletal fragility, making bones more susceptible to fractures.
Question 292: Characteristic radiological feature of fibrous dysplasia is:
- A. Ground glass appearance (Correct Answer)
- B. Cortical erosion
- C. Bone enlargement
- D. Thickened bone matrix
Explanation: ***Ground glass appearance*** - The "ground glass" appearance on **radiography** is a classic and highly characteristic feature of **fibrous dysplasia**, reflecting the immature, woven bone and fibrous tissue within the lesion. - This specific pattern results from the uniform, finely trabeculated osseous tissue that is less dense than normal bone, creating a hazy, frosted appearance. *Cortical erosion* - While significant **tumor growth** in any bone lesion can lead to cortical erosion, it is not a specific or characteristic primary feature of **fibrous dysplasia**. - **Cortical erosion** is more commonly associated with aggressive or rapidly expanding lesions, such as malignant tumors or infections. *Bone enlargement* - **Bone enlargement** can occur in fibrous dysplasia due to the expansion of the abnormal fibrous and osseous tissue, but it is a non-specific finding. - Many conditions, including various **benign** and **malignant tumors**, can cause bone enlargement, making it less diagnostic on its own. *Thickened bone matrix* - Fibrous dysplasia involves a disorganized and immature bone matrix, characterized by **woven bone**, not a thickened, well-organized normal bone matrix. - **Thickened bone matrix** may be seen in conditions like osteopetrosis or Paget's disease, which involve different pathological bone remodeling processes.
Question 293: Popcorn calcification is seen in
- A. Adamantinoma
- B. Chondrosarcoma (Correct Answer)
- C. Osteosarcoma
- D. Multiple myeloma
Explanation: ***Chondrosarcoma*** - **Popcorn calcification** is a classic radiographic sign frequently observed in **chondrosarcoma**, representing calcified cartilage matrix. - This type of calcification is typically seen in tumors arising from **cartilaginous tissue**. *Adamantinoma* - Adamantinoma is a rare, malignant bone tumor characterized by **epithelial cell nests** within a fibrous stroma, primarily affecting the **tibia**. - It usually presents with **lytic lesions** and often contains areas of calcification, but not typically the "popcorn" pattern. *Osteosarcoma* - Osteosarcoma is characterized by the production of **osteoid** by malignant osteoblasts. - Radiographically, it often shows a **sunburst pattern** or **Codman's triangle**, indicative of aggressive periosteal reaction and calcified tumor matrix, distinct from popcorn calcification. *Multiple myeloma* - Multiple myeloma is a **hematologic malignancy** involving plasma cells, leading to widespread osteolytic lesions. - It typically presents as **punched-out lytic lesions** without calcification or osteoblastic activity.
Question 294: Which of the following represents important radiological differentiating features between psoriatic arthritis, rheumatoid arthritis, and ankylosing spondylitis?
- A. Radiological patterns and joint distribution (Correct Answer)
- B. Laboratory markers and genetic associations
- C. Clinical presentation and extra-articular features
- D. Spinal involvement patterns
Explanation: ***Radiological patterns and joint distribution*** - **Radiological patterns and joint distribution** are the most important radiological differentiating features among these three arthropathies. - **Psoriatic arthritis**: Asymmetric distribution, DIP joint involvement, pencil-in-cup deformity, periostitis, and sausage digit appearance; can involve spine with asymmetric sacroiliitis and bulky syndesmophytes. - **Rheumatoid arthritis**: Symmetric polyarticular involvement of MCP, PIP, and wrist joints (DIP spared), periarticular osteoporosis, marginal erosions, uniform joint space narrowing, and subluxations. - **Ankylosing spondylitis**: Predominantly axial involvement with bilateral symmetric sacroiliitis, bamboo spine appearance, thin marginal syndesmophytes, squaring of vertebral bodies, and enthesitis. - These distinct **radiological patterns** allow differentiation based on imaging alone. *Laboratory markers and genetic associations* - While **laboratory markers** (rheumatoid factor, anti-CCP, HLA-B27) and **genetic associations** are important for diagnosis, they are **not radiological features**. - The question specifically asks for **radiological** differentiating features, making this option incorrect despite its clinical importance. - Laboratory data complements imaging but cannot be visualized on radiographs, CT, or MRI. *Clinical presentation and extra-articular features* - **Clinical presentation** and **extra-articular features** (skin psoriasis, uveitis, inflammatory bowel disease) are crucial for diagnosis but are **not radiological features**. - These are clinical findings obtained through history and physical examination, not through imaging studies. - Though they guide which imaging to order, they don't represent radiological differentiating features themselves. *Spinal involvement patterns* - While **spinal involvement patterns** are radiologically visible and help differentiate ankylosing spondylitis from rheumatoid arthritis, this option is too narrow. - It doesn't account for peripheral joint patterns which are crucial for differentiating psoriatic arthritis and rheumatoid arthritis (both can have minimal spinal involvement). - **Radiological patterns and joint distribution** is more comprehensive, encompassing both axial and peripheral manifestations across all three conditions.
Question 295: X-ray appearances of osteosarcoma are all except -
- A. Sunray appearance
- B. Codman's triangle
- C. Soap-bubble (Correct Answer)
- D. Periosteal reaction
Explanation: ***Soap-bubble*** - This appearance is characteristic of a **giant cell tumor**, which is a benign but locally aggressive bone tumor, often found in the **epiphysis** of long bones. - It results from multiple lucencies due to tumor cells eroding into the bone, creating a multicystic appearance. *Sunray appearance* - This describes **spicules of new bone** projecting outwards from the cortex, perpendicular to the bone surface, often seen in aggressive osteosarcomas. - It is a classic radiographic sign indicating **ossification within the soft tissue mass** of the tumor. *Codman's triangle* - This refers to an **elevated periosteum** forming a triangular area of new bone, indicating that the tumor has lifted the periosteum off the cortical surface of the bone. - It is a non-specific sign of primary bone tumor but is commonly associated with aggressive lesions like **osteosarcoma**. *Periosteal reaction* - This is a general term for the **formation of new bone** in response to periosteal irritation or elevation, which can be seen in various conditions including infection, trauma, and tumors. - In osteosarcoma, a periosteal reaction is a key finding, often presenting as a **spiculated, lamellated, or Codman's triangle pattern**, indicating an aggressive lesion.
Question 296: Radiographically, the lesion shown in the image could be:
- A. Cherubism
- B. Garre's osteomyelitis (Correct Answer)
- C. Fibrous dysplasia
- D. Osteosarcoma
Explanation: ***Garre's osteomyelitis*** - The radiographs show **periosteal new bone formation** resembling an **"onion skin"** appearance, which is characteristic of **Garre's osteomyelitis** (chronic osteomyelitis with proliferative periostitis). - This condition is typically a **reaction to low-grade chronic infection** or irritation, often seen in the periosteum of the mandible. *Cherubism* - Cherubism is a **fibro-osseous lesion** characterized by bilateral, symmetric enlargement of the jaws, giving a "cherubic" appearance. - Radiographically, it presents as **multilocular radiolucencies** with poorly defined borders, usually in children. *Fibrous dysplasia* - Fibrous dysplasia is a developmental anomaly where normal bone is replaced by **fibrous tissue and immature bone**. - Radiographically, it often has a **"ground glass" appearance** or a "peau d'orange" texture, differentiating it from the periosteal reaction seen in the image. *Osteosarcoma* - Osteosarcoma is a **malignant bone tumor** that typically shows a mix of osteolytic and osteoblastic areas, often with a **"sunburst" or "spiculated" periosteal reaction**. - While it involves periosteal reaction, the pattern and typical aggressive nature differ from the more layered and milder appearance of Garre's osteomyelitis.
Question 297: What is the investigation of choice for diagnosing a stress fracture?
- A. X-ray
- B. CT scan
- C. MRI (Correct Answer)
- D. Bone scan
Explanation: ***MRI*** - **Magnetic Resonance Imaging (MRI)** is the most sensitive and specific imaging modality for diagnosing **stress fractures**, especially in their early stages. - It can detect **bone marrow edema** and **periosteal reactions** indicative of stress injury before cortical changes are visible on plain radiographs. *X-ray* - **X-rays** are often the initial investigation, but they have low sensitivity for **stress fractures** in the early stages as bone changes may not be apparent for several weeks. - A positive X-ray for stress fracture typically shows a **sclerotic line** or **periosteal reaction**, but this indicates a more advanced injury. *CT scan* - **CT scans** provide excellent detail of **cortical bone** and can detect subtle fractures not seen on X-rays. - While more sensitive than X-rays, CT has **higher radiation exposure** and is generally less sensitive than MRI for early detection of **bone marrow edema** associated with stress injuries. *Bone scan* - **Bone scans** (scintigraphy) are highly sensitive for detecting increased **osteoblastic activity** associated with stress fractures. - However, they are **less specific** as various conditions can cause increased uptake, and they do not provide detailed anatomical information, making MRI superior for definitive diagnosis and staging.
Question 298: Dense cartilage matrix calcification is characteristically seen in
- A. Chondrosarcoma (Correct Answer)
- B. Fibrosarcoma
- C. Chondroblastoma
- D. Osteosarcoma
Explanation: ***Chondrosarcoma*** - This is a **malignant cartilaginous tumor** that characteristically exhibits **dense cartilage matrix calcification** appearing as **ring-and-arc, flocculent, or popcorn-like** calcifications on imaging - This pattern of calcification is a key diagnostic feature differentiating it from other bone tumors - The calcification reflects the chondroid (cartilaginous) matrix produced by the tumor *Fibrosarcoma* - This is a **malignant tumor derived from fibrous tissue** and typically shows **no calcification** because it does not produce cartilage or bone matrix - Radiographically appears as a lytic, destructive lesion lacking the characteristic calcifications *Chondroblastoma* - This is a **rare benign cartilaginous tumor** usually occurring in the **epiphyses of long bones** in skeletally immature patients - While it may show calcification in ~50% of cases, it is typically **fine stippled calcification** rather than the dense ring-and-arc pattern of chondrosarcoma - Usually appears as a well-defined lytic lesion with a sclerotic rim *Osteosarcoma* - This is a **malignant bone-forming tumor** that produces **osteoid matrix calcification** appearing as **cloud-like or amorphous dense calcification** - Also shows characteristic periosteal reactions (**sunburst pattern** or **Codman's triangle**) - The calcification pattern differs from chondrosarcoma as it reflects osseous rather than cartilaginous matrix
Question 299: X-ray features of hypoparathyroidism are the following except:
- A. Calvarial thickening
- B. Subcutaneous calcification
- C. Osteosclerosis
- D. Subperiosteal resorption (Correct Answer)
Explanation: ***Subperiosteal resorption*** - This is a classic radiographic feature of **hyperparathyroidism**, characterized by the breakdown of bone beneath the periosteum, commonly seen in the phalanges. - In **hypoparathyroidism**, bone resorption is *decreased*, leading to increased bone density or **osteosclerosis**, not resorption. *Calvarial thickening* - **Calvarial thickening** can be observed in hypoparathyroidism due to altered bone remodeling processes resulting from chronic low parathyroid hormone (PTH) levels. - The absence of PTH leads to **decreased osteoclastic activity**, promoting bone accumulation. *Subcutaneous calcification* - **Subcutaneous calcification** occurs in hypoparathyroidism due to chronic **hyperphosphatemia** and **hypocalcemia**. - This imbalance can lead to the precipitation of **calcium phosphate crystals** in soft tissues. *Osteosclerosis* - **Osteosclerosis** is a direct consequence of chronic hypoparathyroidism, as the low PTH levels lead to **reduced bone turnover** and decreased osteoclast activity. - This results in an **increase in bone density**, making the bones appear denser on X-ray.
Question 300: All of the following have the same radiographic features except:
- A. Odontoma (Correct Answer)
- B. Keratocyst
- C. Dentigerous cyst
- D. Ameloblastoma
Explanation: ***Odontoma*** - This is the **correct answer** as it is the exception among the listed lesions. - Odontoma is a **benign odontogenic tumor** composed of mature enamel, dentin, cementum, and pulp tissue, which radiographically appears as a **radiopaque mass** (tooth-like structure) often associated with an impacted tooth. - Unlike the other three options which are all **radiolucent**, odontoma's distinct **radiopacity** differentiates it from the predominantly radiolucent cystic and tumoral lesions. *Keratocyst* - This lesion typically presents as a **well-defined, unilocular or multilocular radiolucency** with a smooth, corticated margin. - It does not contain radiopaque calcifications or tooth-like structures. - **Radiographically radiolucent** - similar to the other incorrect options. *Dentigerous cyst* - This cyst is classically seen as a **well-defined, unilocular radiolucency** surrounding the crown of an unerupted or impacted tooth. - Like other cysts, it is predominantly **radiolucent** and lacks internal radiopacities. *Ameloblastoma* - This is a **benign but locally invasive odontogenic tumor** that radiographically appears as a **multilocular ("soap bubble" or "honeycomb") or unilocular radiolucency**. - It is distinctively **radiolucent** and does not exhibit the radiopaque features of tooth-forming lesions.
Practice by Chapter
Radiographic Anatomy of Bones and Joints
Practice Questions
Imaging of Fractures and Dislocations
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Arthritides: Inflammatory and Degenerative
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Metabolic Bone Diseases
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Bone and Soft Tissue Tumors
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Congenital Skeletal Anomalies
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Spine Imaging
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Skeletal Infections
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Sports Medicine Imaging
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Imaging of Prostheses and Implants
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Musculoskeletal Ultrasound
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MSK Interventional Procedures
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