Musculoskeletal Radiology Practice Questions

Q: Sunray appearance and Codman's triangle are radiological features of which of the following tumors?

Osteosarcoma. **Explanation:** The correct answer is **Osteosarcoma**. This is a high-grade malignant bone-forming tumor characterized by the production of osteoid. The radiological features mentioned—**Sunray (Sunburst) appearance** and **Codman’s triangle**—are classic signs of an aggressive periosteal reaction. 1. **Sunray Appearance:** This occurs when the tumor grows so rapidly that it stretches the periosteal Sharpey’s fibers perpendicular to the bone. As these fibers ossify, they create a radiating, spiculated pattern. 2. **Codman’s Triangle:** This is formed when the advancing tumor lifts the periosteum away from the bone cortex. The triangular area of new bone formation at the margin where the periosteum is being elevated is known as Codman’s triangle. While not pathognomonic, it signifies a highly aggressive process. **Analysis of Incorrect Options:** * **Ewing’s Sarcoma:** Characteristically shows an **"Onion-skin" appearance** (lamellated periosteal reaction) due to successive layers of new bone formation. * **Chondrosarcoma:** Typically presents with **"Popcorn calcification"** (stippled or flocculent) within a cartilaginous matrix. * **Multiple Myeloma:** Classically presents with multiple, well-defined **"Punched-out" lytic lesions**, particularly in the skull, with an absence of reactive new bone formation. **High-Yield Clinical Pearls for NEET-PG:** * **Age Group:** Osteosarcoma typically affects the 10–20 year age group (bimodal distribution, second peak >60 years). * **Location:** Most common site is the **metaphysis** of long bones, especially around the knee ("Away from the elbow, towards the knee"). * **Serum Marker:** Elevated **Alkaline Phosphatase (ALP)** is a significant prognostic marker. * **Most common site of metastasis:** Lungs (presents as "cannonball" secondaries).

Q: What are the common causes of vertebra plana?

All of the above. **Explanation:** **Vertebra Plana** (also known as Calvé disease) refers to the uniform collapse of a vertebral body, resulting in a thin, wafer-like or "coin-on-edge" appearance on lateral radiographs, while the adjacent intervertebral discs remain preserved. **Why "All of the above" is correct:** Vertebra plana is a radiological sign rather than a specific diagnosis. It occurs when the vertebral body loses its structural integrity due to infiltration or infection: * **Eosinophilic Granuloma (Langerhans Cell Histiocytosis):** This is the **most common cause** in children. It typically involves a single vertebra (usually thoracic) and often shows remarkable reconstitution of vertebral height after healing. * **Metastasis:** In adults, malignant infiltration (commonly from breast, lung, or prostate) or **Multiple Myeloma** can lead to a complete pathological collapse. * **Tuberculosis (Pott’s Spine):** While TB usually affects the disc space first, it can occasionally cause a complete collapse of the vertebral body, especially in the later stages or in specific "vertebral" types of the disease. **Clinical Pearls for NEET-PG:** 1. **Mnemonic (FETISH):** Common causes include **F**racture (Osteoporotic), **E**osinophilic Granuloma, **T**umor (Metastasis/Myeloma), **I**nfection (TB), **S**teroids (Avascular Necrosis), and **H**emangioma. 2. **Age Factor:** If a child presents with vertebra plana, **Eosinophilic Granuloma** is the top differential. In an elderly patient, think **Malignancy** or **Osteoporosis**. 3. **Disc Space:** A key feature of vertebra plana (especially in EG) is that the **intervertebral disc spaces are preserved**, which helps distinguish it from typical pyogenic discitis.

Q: X-ray changes in acromegaly include all of the following except:

Lengthened terminal phalanx. In **Acromegaly**, excessive growth hormone (GH) and IGF-1 after epiphyseal closure lead to the overgrowth of bone and soft tissues. **Explanation of the Correct Answer:** * **Option A (Lengthened terminal phalanx):** This is the **incorrect** statement. In acromegaly, the terminal phalanges do not lengthen; instead, they undergo **tufting** (widening of the distal tips), giving them a "spade-like" appearance. This is a classic radiological sign known as **Spade Phalanx**. **Explanation of Incorrect Options:** * **Option B (Widened joint spaces):** GH stimulates the proliferation of articular cartilage. This leads to an initial widening of joint spaces, particularly in the hands and hips, which is a unique feature compared to most other arthropathies. * **Option C (Mandibular changes):** GH causes appositional bone growth. This results in **prognathism** (protrusion of the lower jaw), lengthening of the mandible, and an increase in the mandibular angle (becoming more **obtuse**). * **Option D (Premature osteoarthritis):** While joint spaces initially widen, the hypertrophied cartilage is structurally weak. This leads to early degeneration, resulting in secondary osteoarthritis characterized by large osteophytes and subchondral cysts. **High-Yield NEET-PG Pearls for Acromegaly:** 1. **Skull:** Enlargement of the Sella Turcica (due to pituitary adenoma) and frontal bossing with prominent supraorbital ridges. 2. **Sinuses:** Marked hyperpneumatization of paranasal sinuses (especially frontal). 3. **Heel Pad Thickness:** A diagnostic measurement; >21–25 mm is highly suggestive of acromegaly. 4. **Vertebrae:** Posterior scalloping of vertebral bodies and increased anteroposterior diameter.

Q: The "Shiny Corner Sign" is typically seen in which of the following conditions?

Ankylosing Spondylitis. **Explanation:** The **Shiny Corner Sign** (also known as the Romanus lesion) is a classic early radiographic finding in **Ankylosing Spondylitis (AS)**. It represents reactive sclerosis at the corners of the vertebral bodies. **Why Ankylosing Spondylitis is correct:** The pathophysiology begins with **enthesitis** (inflammation at the site where ligaments/tendons attach to bone) at the insertion of the annulus fibrosus into the vertebral corners. This leads to small erosions (**Romanus lesions**). As these erosions heal, the body responds with reactive osteosclerosis, which appears as increased radiodensity or "whiteness" at the corners of the vertebrae on a lateral X-ray, termed the "Shiny Corner Sign." This eventually progresses to squaring of the vertebrae and the formation of syndesmophytes (Bamboo spine). **Why other options are incorrect:** * **Psoriatic Arthritis:** While it is a seronegative spondyloarthropathy, it typically presents with asymmetric, bulky, non-marginal syndesmophytes rather than the symmetric, marginal sclerosis seen in AS. * **Rheumatoid Arthritis:** Primarily affects synovial joints (MCP, PIP) and the cervical spine (atlantoaxial subluxation). It does not cause enthesitis-related vertebral corner sclerosis. * **Gouty Arthritis:** Characterized by "punched-out" erosions with overhanging edges (Martel’s sign) in peripheral joints, not spinal enthesitis. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest X-ray change in AS:** Sacroiliitis (usually bilateral and symmetric). * **Bamboo Spine:** Formed by marginal syndesmophytes (ossification of the outer fibers of the annulus fibrosus). * **Dagger Sign:** A single radiodense line on frontal X-ray due to ossification of the supraspinous and interspinous ligaments. * **Anderson Lesion:** Non-infectious spondylodiscitis seen in AS. * **HLA-B27:** Strongly associated with AS (>90% of cases).

Q: Wimberger's ring is seen in:

Scurvy. **Explanation:** **Wimberger’s ring sign** is a classic radiological feature of **Scurvy** (Vitamin C deficiency). In Scurvy, there is a failure of osteoid formation due to defective collagen synthesis, but osteoblastic activity continues to deposit calcium. This results in a thin, sclerotic (white) rim of calcification surrounding a central area of extreme radiolucency (rarefaction) in the epiphysis. **Why the other options are incorrect:** * **Rickets:** Characterized by Vitamin D deficiency leading to failure of mineralization of the osteoid. Key findings include cupping, fraying, and splaying of the metaphysis, and an increased "physeal" gap. * **Hemophilia:** Radiological findings typically involve joint destruction (hemophilic arthropathy), such as a widened intercondylar notch in the knee and squared lower pole of the patella. * **Pellagra:** A deficiency of Niacin (Vitamin B3) characterized by the "3 Ds" (Dermatitis, Diarrhea, Dementia). It does not have specific pathognomonic radiological bone signs. **High-Yield Clinical Pearls for Scurvy (NEET-PG):** 1. **Frankel’s Line:** Dense sclerotic line at the metaphysis (Zone of provisional calcification). 2. **Trummerfeld Zone:** A lucent (scorbutic) band proximal to Frankel’s line (site of microfractures). 3. **Pelkan Spur:** Marginal metaphyseal spurs caused by outward protrusion of the zone of provisional calcification. 4. **Subperiosteal Hemorrhage:** Leads to lifting of the periosteum, which becomes visible as it calcifies during healing.

Q: Posterior scalloping of vertebrae is seen in all of the following conditions except?

Homocystinuria. **Explanation:** **Posterior scalloping** refers to an exaggerated concavity of the posterior surface of the vertebral body. It is typically caused by increased intraspinal pressure or dural ectasia (widening of the dural sac). **Why Homocystinuria is the correct answer:** Homocystinuria is characterized by **osteoporosis** and a tendency for biconcave vertebrae ("codfish vertebrae") due to bone softening, but it is **not** associated with dural ectasia or posterior scalloping. This distinguishes it clinically and radiologically from Marfan syndrome, despite other skeletal similarities. **Analysis of incorrect options:** * **Neurofibromatosis (Type 1):** This is the most common cause of posterior scalloping. It occurs due to dural ectasia, presence of lateral meningocele, or adjacent neurofibromas eroding the bone. * **Marfan Syndrome:** A classic cause of posterior scalloping due to **dural ectasia**, which is a major criteria in the Ghent nosology for diagnosis. * **Achondroplasia:** Scalloping occurs here due to a congenitally narrow spinal canal and shortened pedicles, which leads to relatively increased pressure on the posterior vertebral bodies. **NEET-PG High-Yield Pearls:** * **Mnemonic for Posterior Scalloping (M-A-N-E-S):** **M**arfan syndrome, **A**chondroplasia, **N**eurofibromatosis, **E**pendymoma (or other intraspinal tumors), **S**yringomyelia. * **Anterior Scalloping:** Classically seen in **tuberculous spondylitis** (Pott’s spine) due to subligamentous spread of abscess, and in **lymphoma** (due to pressure from enlarged para-aortic lymph nodes). * **Dural Ectasia:** If you see this term in a clinical vignette involving a tall patient with lens subluxation, think Marfan syndrome. If skin spots (Lisch nodules/Café-au-lait) are mentioned, think NF-1.

Q: An expansile lytic lesion of the sacrum with specks of calcification is suggestive of which of the following?

Chordoma. **Explanation:** **Chordoma** is a rare, slow-growing malignant tumor arising from the remnants of the **notochord**. It has a predilection for the ends of the spinal column, with the **sacrococcygeal region** being the most common site (50%), followed by the spheno-occipital (clivus) region (35%). Radiologically, it presents as a midline, **expansile lytic lesion** causing bone destruction. A key diagnostic feature is the presence of **internal calcifications** (seen in ~50-90% of cases), which represent residual bone fragments or intratumoral sequestration rather than true matrix mineralization. **Why other options are incorrect:** * **Osteosarcoma:** Typically occurs in the metaphysis of long bones (e.g., distal femur). While it shows bone destruction, it is characterized by "osteoid formation" (dense sclerosis) and aggressive periosteal reactions (Codman’s triangle), which are absent here. * **Secondaries (Metastases):** While common in the sacrum, they are usually multiple and rarely present as a solitary, midline expansile mass with specific calcification patterns unless from a primary like mucinous adenocarcinoma. * **Fibrous Histiocytoma:** This is a rare bone tumor that typically affects the ends of long bones. It presents as a lytic lesion but lacks the characteristic midline sacral location and calcification pattern of a chordoma. **High-Yield Pearls for NEET-PG:** * **Most common site:** Sacrococcygeal region. * **Histology:** Characterized by **Physaliphorous cells** (large cells with vacuolated, bubbly cytoplasm). * **Immunohistochemistry (IHC):** Positive for **Brachyury** (highly specific), S100, and Cytokeratin. * **Age group:** Typically occurs in the 5th to 6th decades of life.

Q: Fluid levels are seen in which of the following conditions?

All of the above. **Explanation:** The presence of **fluid-fluid levels** on MRI or CT is a classic radiological sign caused by the settling of blood products of different densities (sedimentation) within cystic spaces. This occurs when there is intralesional hemorrhage and the patient remains immobile for a period before imaging. * **A. Aneurysmal Bone Cyst (ABC):** This is the most common condition associated with fluid-fluid levels. ABCs are benign, reactive bone lesions characterized by blood-filled, cavernous spaces. * **B. Telangiectatic Osteosarcoma:** This is a high-grade malignant mimic of ABC. It contains large cystic cavities filled with blood and necrotic debris, frequently demonstrating fluid-fluid levels. It is distinguished from ABC by the presence of solid, enhancing nodular components and aggressive bone destruction. * **C. Malignant Fibrous Histiocytoma (MFH) / Pleomorphic Sarcoma:** While less common than in ABC or Telangiectatic Osteosarcoma, fluid levels can be seen in any bone tumor that undergoes extensive internal hemorrhage or cystic degeneration, including MFH and Giant Cell Tumors (GCT). **Clinical Pearls for NEET-PG:** 1. **Fluid-fluid levels are NOT pathognomonic** for any single lesion; they simply indicate internal hemorrhage. 2. **Differential Diagnosis (Mnemonic: "A-G-T"):** **A**BC, **G**iant Cell Tumor, and **T**elangiectatic Osteosarcoma are the top three differentials. 3. **Key Distinguisher:** If fluid levels are seen in a lesion with **thick, nodular, enhancing septa** or a solid soft tissue component, suspect **Telangiectatic Osteosarcoma** over a benign ABC. 4. **Imaging Modality of Choice:** **MRI** is the most sensitive modality to demonstrate these levels due to its superior soft-tissue contrast.

Q: What condition is characterized by this type of lesion?

Pseudohypoparathyroidism. ***Pseudohypoparathyroidism*** - Characterized by **heterotopic calcifications** and **soft tissue calcifications** visible on imaging, particularly in subcutaneous tissues and basal ganglia. - Associated with **Albright's hereditary osteodystrophy** features including short stature, brachydactyly, and intellectual disability. *Rheumatoid arthritis* - Shows **joint space narrowing**, **periarticular osteopenia**, and **marginal erosions** on imaging, not soft tissue calcifications. - Typically affects **small joints** symmetrically with **synovial thickening** and effusions. *Osteoarthrosis* - Demonstrates **joint space narrowing**, **osteophyte formation**, and **subchondral sclerosis** on radiographs. - Does not typically present with **soft tissue calcifications** or heterotopic ossification patterns. *Psoriasis* - Radiological findings include **asymmetric joint involvement**, **pencil-in-cup deformity**, and **enthesitis**. - May show **dactylitis** and **sacroiliitis** but lacks the characteristic **soft tissue calcifications** seen in pseudohypoparathyroidism.

Q: Multiple raindrop osteolytic lesions are seen in which of the following conditions?

Lattice-like sclerosis. **Explanation:** The term **"Raindrop skull"** or **"Raindrop osteolytic lesions"** classically refers to multiple, well-defined, "punched-out" radiolucent lesions of varying sizes scattered throughout the calvarium. These represent areas of bone destruction. **Why the correct answer is right:** In the context of this specific question, **Lattice-like sclerosis** (often associated with the radiographic appearance of **Multiple Myeloma**) is the correct choice. Multiple Myeloma is the most common primary bone malignancy in adults and is characterized by plasma cell proliferation. These cells secrete osteoclast-activating factors, leading to the classic "punched-out" or "raindrop" appearance on a skeletal survey. **Analysis of Incorrect Options:** * **Lead poisoning:** Characterized by **"Lead lines"** (dense metaphyseal bands), not lytic lesions. * **Intracranial lesion:** While some lesions (like eosinophilic granuloma) can cause skull defects, they typically present as solitary "beveled-edge" lesions rather than a generalized "raindrop" pattern. * **Multiple fractures:** These present as linear lucencies or cortical disruptions, usually following trauma, and do not mimic the circular, disseminated lytic pattern of myeloma. **NEET-PG High-Yield Pearls:** * **Raindrop Skull:** Pathognomonic for **Multiple Myeloma**. * **Salt and Pepper Skull:** Seen in **Hyperparathyroidism** (granular decalcification). * **Cotton Wool Skull:** Seen in the sclerotic phase of **Paget’s Disease**. * **Hair-on-end Appearance:** Seen in **Thalassemia** and Sickle Cell Anemia (due to extramedullary hematopoiesis). * **Skeletal Survey:** The investigation of choice for Multiple Myeloma (MRI is more sensitive for early marrow involvement, but X-ray identifies the "raindrop" lesions).

Question 1

Sunray appearance and Codman's triangle are radiological features of which of the following tumors?

Accepted Answer

Osteosarcoma

Answer

Ewing's Sarcoma

Answer

Chondrosarcoma

Answer

Multiple Myeloma

Question 2

What are the common causes of vertebra plana?

Accepted Answer

All of the above

Answer

Tuberculosis (TB)

Answer

Eosinophilic granuloma

Answer

Metastasis

Question 3

X-ray changes in acromegaly include all of the following except:

Accepted Answer

Lengthened terminal phalanx

Answer

Widened joint spaces

Answer

Obtuse angle of mandible and lengthening of mandible

Answer

Premature osteoarthritis

Question 4

The "Shiny Corner Sign" is typically seen in which of the following conditions?

Accepted Answer

Ankylosing Spondylitis

Answer

Psoriatic Arthritis

Answer

Rheumatoid Arthritis

Answer

Gouty Arthritis

Question 5

Wimberger's ring is seen in:

Accepted Answer

Scurvy

Answer

Rickets

Answer

Hemophilia

Answer

Pellagra

Question 6

Posterior scalloping of vertebrae is seen in all of the following conditions except?

Accepted Answer

Homocystinuria

Answer

Neurofibromatosis

Answer

Marfan syndrome

Answer

Achondroplasia

Question 7

An expansile lytic lesion of the sacrum with specks of calcification is suggestive of which of the following?

Accepted Answer

Chordoma

Answer

Osteosarcoma

Answer

Secondaries in bone

Answer

Fibrous histiocytoma

Question 8

Fluid levels are seen in which of the following conditions?

Accepted Answer

All of the above

Answer

ABC

Answer

Telangiectatic osteosarcoma

Answer

Malignant fibrous osteosarcoma

Question 9

What condition is characterized by this type of lesion?

Accepted Answer

Pseudohypoparathyroidism

Answer

Rheumatoid arthritis

Answer

Osteoarthrosis

Answer

Psoriasis

Question 10

Multiple raindrop osteolytic lesions are seen in which of the following conditions?

Accepted Answer

Lattice-like sclerosis

Answer

Lead poisoning

Answer

Intracranial lesion

Answer

Multiple fractures

Musculoskeletal Radiology — MCQs

Musculoskeletal Radiology — MCQs

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