Musculoskeletal Radiology Practice Questions

Q: Acro-osteolysis is seen in which of the following conditions?

Scleroderma. **Explanation:** **Acro-osteolysis** refers to the resorption or destruction of the distal phalanges (tufts) of the fingers or toes. It is a classic radiological sign with a specific differential diagnosis. **Why Scleroderma is Correct:** In **Scleroderma (Systemic Sclerosis)**, acro-osteolysis occurs due to chronic digital ischemia (Raynaud’s phenomenon) and pressure from tightened, atrophic skin (sclerodactyly). It is often associated with **soft tissue calcification (calcinosis cutis)**, which is a hallmark of the CREST syndrome. **Analysis of Incorrect Options:** * **Frostbite:** While severe frostbite can cause digital necrosis, it typically leads to localized bone loss or secondary osteoarthritis rather than the classic progressive tuft resorption seen in systemic diseases. * **Leprosy:** Leprosy causes bone resorption, but it is usually "concentric remodeling" or "licking stick" appearance due to sensory neuropathy and secondary trauma/infection, rather than primary acro-osteolysis. * **Hypoparathyroidism:** This condition is associated with increased bone density (osteosclerosis) or basal ganglia calcification. It is **Hyperparathyroidism** (specifically the subperiosteal resorption) that is associated with acro-osteolysis. **High-Yield Clinical Pearls for NEET-PG:** To remember the causes of acro-osteolysis, use the mnemonic **"PINCH"**: * **P:** Psoriasis / Pyknodysostosis (associated with osteosclerosis and delayed suture closure). * **I:** Injury (Thermal burns, Frostbite). * **N:** Neuropathy (Diabetes, Leprosy). * **C:** Collagen Vascular Disease (Scleroderma). * **H:** Hyperparathyroidism (Primary or Secondary). **Key Distinction:** If a question mentions acro-osteolysis with **soft tissue calcification**, always think **Scleroderma**. If it mentions acro-osteolysis with **short stature and dense bones**, think **Pyknodysostosis**.

Q: Onion peel appearance on radiograph is not seen in which of the following conditions?

Fibrous dysplasia. **Explanation:** The "onion peel" appearance (lamellated periosteal reaction) is a radiographic sign caused by the rhythmic or episodic lifting of the periosteum, leading to the deposition of multiple concentric layers of new bone. **1. Why Fibrous Dysplasia is the Correct Answer:** Fibrous dysplasia is a benign fibro-osseous lesion where normal bone is replaced by fibrous tissue and immature trabeculae. It is an **intramedullary** process that does not typically involve the periosteum. Therefore, it does not produce a periosteal reaction. Its classic radiographic appearance is described as **"Ground-glass opacification"** with a well-defined "rind" of sclerotic bone. **2. Analysis of Incorrect Options:** * **Ewing’s Sarcoma:** This is the classic association for onion peel appearance. The aggressive nature of this tumor causes rapid, successive layers of periosteal bone formation. * **Garre’s Osteomyelitis:** Also known as Chronic Sclerosing Osteomyelitis with proliferative periostitis. It is a low-grade chronic infection (often in the mandible) that stimulates the periosteum to form reactive peripheral bone in a lamellated pattern. * **Osteogenic Sarcoma (Osteosarcoma):** While "Sunburst" and "Codman’s triangle" are more common, Osteosarcoma is a highly aggressive tumor that can occasionally present with a lamellated (onion peel) appearance depending on the rate of tumor growth. **Clinical Pearls for NEET-PG:** * **Onion Peel Appearance:** Seen in Ewing’s sarcoma, Garre’s osteomyelitis, Osteosarcoma, and sometimes Langerhans Cell Histiocytosis (LCH). * **Ground Glass Appearance:** Pathognomonic for Fibrous Dysplasia. * **Sunburst/Sunray Appearance:** Highly suggestive of Osteosarcoma. * **Codman’s Triangle:** Indicates an aggressive process (malignancy or subperiosteal abscess) lifting the periosteum rapidly.

Q: The following radiographs are most likely associated with which condition?

Hyperparathyroidism. ***Hyperparathyroidism*** - Classic radiological features include **subperiosteal bone resorption** (especially in phalanges), **salt-and-pepper skull** appearance, and **brown tumors**. - Additional findings may include **rugger jersey spine**, **loss of dental lamina dura**, and **osteoporosis** due to excessive **parathyroid hormone (PTH)** secretion. *Hyperpituitarism* - Radiographic changes primarily involve **enlarged sella turcica** and **acromegalic features** like enlarged hands, feet, and jaw. - Bone changes are typically **thickening and coarsening** rather than the resorptive patterns seen in hyperparathyroidism. *Hypoparathyroidism* - Characterized by **increased bone density** and **sclerotic changes** due to low PTH levels and calcium deposition. - May show **basal ganglia calcifications** and **cataracts**, but lacks the bone resorptive features typical of hyperparathyroidism. *Hyperthyroidism* - Radiological findings include **osteoporosis** and **accelerated bone turnover**, but without specific resorptive patterns. - May show **thyroid enlargement** on chest X-ray, but lacks the characteristic **subperiosteal resorption** seen in hyperparathyroidism.

Q: Which of the following conditions is NOT characterized by the radiographic abnormality shown in the X-ray skull?

Paget's disease. ***Paget's disease*** - Paget's disease characteristically shows a **cotton-wool appearance** or **osteoporosis circumscripta** pattern on skull X-rays, not punched-out lytic lesions. - The radiographic pattern involves **mixed lytic and sclerotic changes** with bone thickening, distinctly different from the discrete lytic lesions shown. *Multiple Myeloma* - Multiple myeloma classically presents with **punched-out lytic lesions** without sclerotic borders on skull X-rays. - These lesions result from **plasma cell infiltration** causing bone destruction and appear as well-defined radiolucent areas. *Histiocytosis X* - Histiocytosis X (Langerhans cell histiocytosis) produces **punched-out lytic skull lesions** with sharply defined margins. - The lesions often have a **beveled edge** appearance and can occur in multiple sites throughout the skull. *Hyperparathyroidism* - Hyperparathyroidism causes **salt-and-pepper skull** appearance with multiple small lytic lesions throughout the calvarium. - The **subperiosteal bone resorption** and generalized osteopenia create a pattern of diffuse lytic changes in the skull bones.

Q: Which of the following is NOT a radiological change in mucopolysaccharidosis?

Genu varum. The radiological hallmark of Mucopolysaccharidosis (MPS), particularly Hurler syndrome (MPS I) and Morquio syndrome (MPS IV), is **Dysostosis Multiplex**. ### **Why Genu Varum is the Correct Answer** In Mucopolysaccharidosis, the characteristic lower limb deformity is **Genu Valgum (knock-knees)**, not Genu varum (bow-legs). This occurs due to metaphyseal dysplasia and ligamentous laxity, which are common features of the disease. Genu varum is more typically associated with conditions like Rickets or Blount’s disease. ### **Analysis of Incorrect Options** * **A. J-shaped sella turcica:** This is a classic finding in MPS. It occurs because of an enlarged pituitary fossa with a shallow, elongated configuration, often due to thickened dura or arachnoid cysts. * **B. Spatulate ribs:** Also known as "oar-shaped" ribs, this refers to the characteristic widening of the anterior ribs with narrowing of the posterior vertebral ends. * **C. Anterior beaking of the vertebrae:** This is a pathognomonic sign. In **Hurler syndrome**, there is **inferior** anterior beaking (leading to kyphosis/gibbus deformity), while in **Morquio syndrome**, there is **central** anterior beaking (platyspondyly). ### **High-Yield Clinical Pearls for NEET-PG** * **Hand Findings:** "Claw hand" deformity with proximal tapering of the metacarpals (bullet-shaped metacarpals). * **Skull:** Macrocephaly with frontal bossing and thickened calvarium. * **Pelvis:** Flared iliac wings with shallow acetabula and femoral head epiphysial dysplasia. * **Morquio Syndrome (MPS IV):** Distinctive for causing severe **Platyspondyly** (flat vertebrae) and **Odontoid hypoplasia**, which carries a high risk of atlantoaxial subluxation.

Q: Dense calcification is found in which of the following?

Osteosarcoma. ### Explanation **Correct Option: A. Osteosarcoma** The hallmark of **Osteosarcoma** is the production of **osteoid** (immature bone) by malignant cells. This osteoid undergoes mineralization, leading to dense, "cloud-like" or "ivory-like" amorphous calcification within the tumor matrix. On imaging, this is often associated with aggressive features such as the **Codman’s triangle** or a **Sunburst periosteal reaction**, reflecting the rapid elevation of the periosteum and bone formation. **Analysis of Incorrect Options:** * **B. Chondroblastoma:** This is a benign cartilaginous tumor typically found in the **epiphysis**. While it can show calcification, it is classically described as **"chicken-wire" calcification** (thin, reticular patterns), which is not "dense" compared to osteosarcoma. * **C. Synovial Sarcoma:** This is a soft tissue sarcoma. While it shows calcification in about 30% of cases, it is usually **speckled or peripheral** and located within a soft tissue mass near a joint, rather than dense bony mineralization. * **D. Osteoblastoma:** Although it produces osteoid, it is a benign lesion (often >2cm). The mineralization is usually less dense and more organized than the chaotic, dense malignant osteoid seen in Osteosarcoma. **High-Yield Clinical Pearls for NEET-PG:** * **Matrix Patterns:** * *Osteoid matrix:* Cloud-like, dense, ivory-like (Osteosarcoma). * *Chondroid matrix:* Punctate, popcorn-like, comma-shaped, or rings-and-arcs (Chondrosarcoma, Enchondroma). * **Age Group:** Osteosarcoma has a bimodal distribution (10–20 years and >60 years associated with Paget’s disease). * **Location:** Most common site is the **metaphysis** of long bones (distal femur > proximal tibia).

Q: What is the earliest radiological feature in rheumatoid arthritis?

Peria-articular soft tissue swelling. **Explanation:** Rheumatoid Arthritis (RA) is a chronic inflammatory polyarthritis characterized by synovial hypertrophy (pannus formation). Understanding the chronological progression of imaging findings is crucial for NEET-PG. **1. Why "Peri-articular soft tissue swelling" is correct:** The earliest pathological change in RA is **synovitis**. This inflammation leads to increased fluid and thickening of the joint capsule and surrounding soft tissues. On X-ray, this manifests as a fusiform (spindle-shaped) increase in soft tissue density around the joint. This precedes any bony or cartilaginous changes. **2. Analysis of Incorrect Options:** * **Juxta-articular osteoporosis (B):** This is the **earliest bony change**. It occurs due to increased blood flow (hyperemia) to the inflamed synovium, which stimulates osteoclast activity in the adjacent bone. While early, it occurs after the initial soft tissue swelling. * **Subchondral erosions (D):** These occur as the pannus begins to destroy the bone at the "bare areas" (where the bone is not covered by hyaline cartilage). This is a sign of established disease. * **Decreased joint space (A):** This represents the destruction of articular cartilage. It is a later feature compared to soft tissue swelling and osteoporosis. **Clinical Pearls for NEET-PG:** * **Earliest Sign (Overall):** Peri-articular soft tissue swelling. * **Earliest Bony Sign:** Juxta-articular osteoporosis (also called "peri-articular osteopenia"). * **Earliest Site of Erosions:** The "bare areas" of the joint (marginal erosions). * **Most Sensitive Imaging Modality:** **MRI** is more sensitive than X-ray for detecting early synovitis and bone marrow edema. **Ultrasound** with Power Doppler is also highly effective for detecting early vascularization of the pannus. * **Classic Distribution:** Symmetrical involvement of MCP, PIP, and MTP joints; typically spares the DIP joints.

Q: The "codfish" vertebra is not commonly seen in which of the following conditions?

Gaucher's disease. **Explanation:** The **"Codfish" vertebra** (also known as biconcave vertebra) refers to a radiological appearance where the superior and inferior surfaces of the vertebral bodies become concave. This occurs when the intervertebral discs, which are under pressure, bulge into the weakened, softened vertebral bodies. **Why Gaucher’s Disease is the correct answer:** In **Gaucher’s disease**, the characteristic spinal deformity is the **"H-shaped" vertebra** (also known as the Reynolds sign). This is caused by microvascular occlusion and central endplate infarction (similar to Sickle Cell Anemia), leading to a sharp, rectangular step-like depression in the center of the endplate, rather than the smooth, generalized biconcavity seen in "codfish" vertebrae. **Analysis of Incorrect Options:** * **Osteoporosis:** This is the most common cause of codfish vertebrae. The loss of bone density leads to generalized weakening, allowing the nucleus pulposus to indent the endplates. * **Osteogenesis Imperfecta:** Due to defective Type I collagen, the bones are abnormally brittle and soft, frequently resulting in multiple biconcave vertebral deformities. * **Renal Osteodystrophy:** This condition involves high-turnover bone disease (osteitis fibrosa cystica) and osteomalacia. The softened osteoid is susceptible to the pressure of the discs, leading to the codfish appearance. **NEET-PG High-Yield Pearls:** * **Codfish Vertebra:** Seen in conditions of **diffuse bone softening** (Osteoporosis, Osteomalacia, Osteogenesis Imperfecta, Hyperparathyroidism). * **H-shaped Vertebra:** Seen in **Sickle Cell Anemia**, **Gaucher’s Disease**, and sometimes Thalassemia. * **Rugger-Jersey Spine:** Classic sign of **Renal Osteodystrophy** (sclerosis of the endplates). * **Picture Frame Vertebra:** Characteristic of **Paget’s Disease**. * **Ivory Vertebra:** Seen in **Hodgkin’s Lymphoma**, Paget’s, and Metastasis (Prostate).

Q: An ill-defined lesion margin is described as:

Blending. **Explanation:** In musculoskeletal radiology, the margin of a bone lesion is the most reliable indicator of its **growth rate** and **biological aggressiveness**. This is categorized using the **Lodwick Classification**. **Why "Blending" is correct:** An **ill-defined or blending margin** (Lodwick Type II or III) occurs when the transition zone between the lesion and the healthy bone is wide and imperceptible. This indicates a rapidly progressing process, such as a **malignant bone tumor** (e.g., Osteosarcoma, Ewing’s sarcoma) or **acute osteomyelitis**. The body does not have enough time to mount a reactive sclerotic response to contain the lesion, causing it to "blend" into the surrounding marrow. **Analysis of Incorrect Options:** * **A. Sclerotic:** This refers to a thick, radio-opaque (white) border of reactive bone. It indicates a very slow-growing, benign process (Lodwick Type IA). * **C. Corticated:** Similar to sclerotic, this is a thin, well-defined sharp border resembling normal cortex. it signifies a benign, slow-growing lesion (e.g., simple bone cyst). * **D. Punched out:** These are well-defined lesions with a narrow zone of transition but *without* a sclerotic rim. They are characteristic of **Multiple Myeloma**. **NEET-PG High-Yield Pearls:** * **Narrow Zone of Transition:** Suggests a benign/slow-growing lesion (Sclerotic/Geographic). * **Wide Zone of Transition:** Suggests an aggressive/malignant lesion (Permeative/Moth-eaten/Blending). * **Lodwick Classification:** The standard system used to grade the aggressiveness of bone destruction based on margins. * **Sunburst appearance & Codman’s triangle:** Often associated with aggressive lesions showing blending margins (e.g., Osteosarcoma).

Q: The Insall-Salvati index is used for assessing which anatomical structure?

Patella. The **Insall-Salvati index** is a radiographic measurement used to assess the position of the **patella** (kneecap) relative to the tibia. It is calculated on a lateral knee X-ray (ideally flexed at 30°) by dividing the length of the patellar tendon (LT) by the greatest diagonal length of the patella (LP). * **Normal Index:** 0.8 to 1.2. * **Patella Alta (High-riding patella):** Index >1.2. This is associated with patellar tendon rupture or recurrent patellar subluxation. * **Patella Baja (Low-riding patella):** Index <0.8. This is seen in conditions like Osgood-Schlatter disease, polio, or post-surgical scarring. **Explanation of Incorrect Options:** * **Olecranon (A):** The olecranon is part of the proximal ulna. While its fractures are common in radiology, the Insall-Salvati index does not apply to the elbow. * **Talus (B):** Measurements for the talus include the Boehler’s angle (for calcaneal fractures) or the Talar tilt, but not the Insall-Salvati index. * **Scaphoid (D):** Scaphoid imaging focuses on the "Scaphoid view" and assessing the scapholunate interval or Gilula’s lines. **High-Yield Clinical Pearls for NEET-PG:** * **Modified Insall-Salvati Index:** Uses the length of the posterior articular surface of the patella instead of the whole bone; it is considered more accurate in some cases. * **Other Knee Indices:** The **Blackburne-Peel** and **Caton-Deschamps** indices are alternative methods to assess patellar height. * **Radiology Sign:** A high-riding patella on a lateral X-ray after trauma is a classic sign of a **patellar tendon tear**.

Question 1

Acro-osteolysis is seen in which of the following conditions?

Accepted Answer

Scleroderma

Answer

Frostbite

Answer

Leprosy

Answer

Hypoparathyroidism

Question 2

Onion peel appearance on radiograph is not seen in which of the following conditions?

Accepted Answer

Fibrous dysplasia

Answer

Garre's osteomyelitis

Answer

Ewing's sarcoma

Answer

Osteogenic sarcoma

Question 3

The following radiographs are most likely associated with which condition?

Accepted Answer

Hyperparathyroidism

Answer

Hyperpituitarism

Answer

Hypoparathyroidism

Answer

Hyperthyroidism

Question 4

Which of the following conditions is NOT characterized by the radiographic abnormality shown in the X-ray skull?

Accepted Answer

Paget's disease

Answer

Multiple Myeloma

Answer

Histiocytosis X

Answer

Hyperparathyroidism

Question 5

Which of the following is NOT a radiological change in mucopolysaccharidosis?

Accepted Answer

Genu varum

Answer

J shaped sella turcica

Answer

Spatulate ribs

Answer

Anterior beaking of the vertebrae

Question 6

Dense calcification is found in which of the following?

Accepted Answer

Osteosarcoma

Answer

Chondroblastoma

Answer

Synovial sarcoma

Answer

Osteoblastoma

Question 7

What is the earliest radiological feature in rheumatoid arthritis?

Accepted Answer

Peria-articular soft tissue swelling

Answer

Decreased joint space

Answer

Juxta-articular osteoporosis

Answer

Subchondral erosions

Question 8

The "codfish" vertebra is not commonly seen in which of the following conditions?

Accepted Answer

Gaucher's disease

Answer

Osteoporosis

Answer

Osteogenesis Imperfecta

Answer

Renal Osteodystrophy

Question 9

An ill-defined lesion margin is described as:

Accepted Answer

Blending

Answer

Sclerotic

Answer

Corticated

Answer

Punched out

Question 10

The Insall-Salvati index is used for assessing which anatomical structure?

Accepted Answer

Patella

Answer

Olecranon

Answer

Talus

Answer

Scaphoid

Musculoskeletal Radiology — MCQs

Musculoskeletal Radiology — MCQs

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