Musculoskeletal Radiology Practice Questions

Q: A 60-year-old man presents with bone pain and fatigue. His skull X-ray is shown in the image. This appearance is most suggestive of which of the following conditions?

Multiple myeloma. ***Multiple myeloma*** - **Punched-out lytic lesions** (raindrop skull or Swiss-cheese appearance) in a 60-year-old with bone pain and fatigue is classic for multiple myeloma. - **Plasma cell malignancy** commonly causes **hypercalcemia**, **anemia**, and **renal dysfunction** along with characteristic skull lesions. *Eosinophilic granuloma* - Typically presents as a **single well-defined lytic lesion** with **beveled edges** rather than multiple punched-out lesions. - More common in **children and young adults**, not elderly patients with systemic symptoms. *Hyperparathyroidism* - Causes **pepper-pot skull** or **granular osteoporosis** with diffuse bone resorption, not discrete punched-out lesions. - Associated with **elevated calcium** and **PTH levels**, but lesions appear more diffuse and granular. *Acromegaly* - Results in **bone enlargement** and **thickening** due to excess growth hormone, not lytic destruction. - Skull shows **frontal bossing** and **enlarged sinuses**, opposite of the destructive lesions seen here.

Q: On X-ray, joint swelling and intra-articular calcification appearance is seen in which condition?

Charcot's joint. **Explanation:** **Charcot’s Joint (Neuropathic Arthropathy)** is the correct answer because it is characterized by progressive joint destruction due to a loss of pain and proprioception. On X-ray, it presents with the classic **"6 Ds"**: **D**istention (joint swelling/effusion), **D**isorganization, **D**islocation, **D**ebris (intra-articular calcification/loose bodies), **D**ensity (sclerosis), and **D**estruction. The "intra-articular calcification" mentioned in the question refers to the bony debris and fragmentation resulting from repetitive microtrauma to a denervated joint. **Why other options are incorrect:** * **Osteopetrosis:** Characterized by a generalized increase in bone density ("Marble Bone Disease") and a "bone-within-bone" appearance, but not typically intra-articular calcification or joint swelling. * **Paget’s Disease:** Features include cortical thickening, coarsened trabeculae, and bone enlargement (e.g., "Picture Frame Vertebra"). It is a metabolic bone disease, not primarily a joint-destructive process with debris. * **Rheumatoid Arthritis:** Typically shows periarticular osteopenia, symmetrical joint space narrowing, and marginal erosions. It does not cause the exuberant intra-articular calcification or "debris" seen in Charcot’s joint. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Diabetes Mellitus (affects foot/ankle). * **Syringomyelia:** Classically affects the shoulder joint. * **Tabes Dorsalis (Syphilis):** Classically affects the knee joint. * **Radiological Hallmark:** The presence of significant joint destruction and debris in a patient who presents with relatively little pain (clinical-radiological dissociation).

Q: Ankylosis of the temporomandibular joint (TMJ) can be best visualized in which radiographic view?

Transcranial view. ### Explanation **Correct Answer: C. Transcranial view** The **Transcranial view (Schuller’s projection)** is considered the standard plain film radiographic technique for evaluating the **Temporomandibular Joint (TMJ)**. In this view, the X-ray beam is directed at a 20–25 degree cranial angle, which helps project the dense petrous part of the temporal bone away from the joint. This allows for a clear visualization of the **lateral aspect of the joint space**, the mandibular condyle, and the articular eminence. It is particularly effective for identifying **ankylosis** (bony or fibrous fusion), as it provides a profile view of the joint space narrowing and bony bridges. **Analysis of Incorrect Options:** * **A. Lateral oblique view:** While used for the body and ramus of the mandible, it often results in significant superimposition of the contralateral side and cervical spine, making it suboptimal for detailed TMJ joint space analysis. * **B. Lateral view:** A true lateral view of the skull causes the two TMJs to overlap completely, making it impossible to distinguish pathology in a single joint. * **D. Posterior-anterior (PA) view:** This view is primarily used to assess mediolateral displacements or fractures of the mandible. The base of the skull and the petrous temporal bone obscure the TMJ details in this projection. **Clinical Pearls for NEET-PG:** * **Gold Standard:** While Transcranial view is the best *plain film*, **CT scan** is the overall gold standard for bony ankylosis, and **MRI** is the gold standard for internal derangements (disc displacement). * **Reverse Towne’s View:** This is the best plain film projection to visualize the **condylar neck** and high fractures of the condyle. * **Ankylosis Etiology:** In children, the most common cause of TMJ ankylosis is **trauma** (often an undiagnosed chin injury), followed by infection (otitis media).

Q: Which of the following is NOT a radiological feature of scleroderma?

Bullet shaped vertebra. **Explanation:** **Scleroderma (Systemic Sclerosis)** is a multisystem connective tissue disorder characterized by fibrosis and vascular abnormalities. The correct answer is **D (Bullet-shaped vertebra)** because this is a classic radiological feature of **Achondroplasia** and certain **Mucopolysaccharidoses** (like Hurler syndrome), not scleroderma. **Analysis of Options:** * **Acroosteolysis (Option A):** This refers to the resorption of the distal phalangeal tufts. In scleroderma, it occurs due to chronic ischemia from Raynaud’s phenomenon and digital vasculopathy. It is a hallmark finding. * **Calcinosis (Option B):** Part of the **CREST syndrome**, these are soft tissue calcifications (Calcinosis cutis) typically found in the periarticular regions of the fingers and pressure points like the elbows. * **Erosion of superior aspect of ribs (Option C):** This is a specific, high-yield radiological sign of scleroderma. It typically involves the posterior aspects of the 3rd to 6th ribs due to intercostal muscle atrophy and pressure from the overlying skin. **Clinical Pearls for NEET-PG:** * **CREST Syndrome:** Calcinosis, Raynaud’s, Esophageal dysmotility, Sclerodactyly, Telangiectasia. * **Gastrointestinal:** "Hide-bound" appearance of the small bowel (closely packed valvulae conniventes) and wide-mouthed sacculations (pseudodiverticula) in the colon. * **Pulmonary:** NSIP (Non-specific Interstitial Pneumonia) is the most common pattern of lung involvement. * **Mandible:** Symmetrical widening of the periodontal ligament space is a characteristic dental finding.

Q: X-ray skull characteristically shows "Hair on end" appearance in which of the following diseases?

Neuroblastoma. **Explanation:** The **"Hair-on-end" appearance** (also known as the crew-cut sign) is a classic radiological finding on a lateral skull X-ray. It occurs due to **periosteal reaction** or compensatory **extramedullary hematopoiesis**, where new bone is deposited in thin, vertical spicules perpendicular to the outer table of the skull. **Why Neuroblastoma is correct:** While most commonly associated with chronic hemolytic anemias, **metastatic Neuroblastoma** is a classic cause of this appearance. In this context, the "hair-on-end" look is caused by **subperiosteal metastases** that trigger a rapid, spiculated periosteal reaction. This is a high-yield distinction for NEET-PG, as it represents a malignant cause of this sign. **Analysis of Incorrect Options:** * **Still’s Disease (Systemic Juvenile Idiopathic Arthritis):** Typically presents with joint space narrowing, periarticular osteopenia, and growth plate abnormalities, not spiculated skull reactions. * **Scurvy:** Characterized by specific signs like the **Wimberger ring sign** (epiphyseal lucency), **Frankel’s line** (dense zone of provisional calcification), and **Pelkan spurs**, but not the hair-on-end sign. * **Cirrhosis of Liver:** Does not involve the skull in this manner; it may be associated with hepatic osteodystrophy (osteoporosis), but not periosteal spiculation. **High-Yield Clinical Pearls for NEET-PG:** * **Differential Diagnosis for "Hair-on-end" appearance:** 1. **Thalassemia Major** (Most common cause; due to marrow expansion). 2. **Sickle Cell Anemia.** 3. **Metastatic Neuroblastoma** (Malignant cause). 4. **Iron Deficiency Anemia** (Severe/Chronic). * **Key Distinction:** In anemias, the "hair-on-end" appearance usually **spares the occipital bone** because it lacks significant bone marrow, whereas in Neuroblastoma, the distribution can be more irregular.

Q: What is shown in the X-ray skull?

Punched-out (raindrop) skull appearance. ***Punched-out (raindrop) skull appearance*** - Characterized by **multiple discrete punched-out or raindrop lytic lesions** throughout the skull. - Commonly associated with **multiple myeloma**, where bone destruction creates numerous small radiolucent areas. *Artifacts* - Result from **technical errors** during X-ray acquisition, such as patient movement, equipment malfunction, or processing issues. - Present as **irregular patterns** or distortions that don't follow anatomical structures and can be reproduced with repeat imaging. *Silver-beaten appearance* - Shows **generalized thinning** of the inner table of the skull with a beaten metal-like appearance on X-ray. - Associated with **raised intracranial pressure** in children, causing chronic pressure effects on the developing skull. *Mug shot with pellets* - Refers to **retained metallic foreign bodies** (like shotgun pellets) visible as **radiopaque densities** on skull X-ray. - Appears as **discrete, well-defined metallic objects** with characteristic shape and density, not the diffuse lytic pattern seen here.

Q: The "Double PCL" sign on MRI knee is typically seen in which of the following conditions?

Medial meniscus tear. The **"Double PCL" sign** is a classic radiological finding on sagittal MRI of the knee, highly specific for a **bucket-handle tear of the medial meniscus**. ### Why Medial Meniscus Tear is Correct A bucket-handle tear occurs when a longitudinal tear allows the inner fragment of the meniscus to displace centrally into the intercondylar notch. When this happens to the **medial meniscus**, the displaced fragment comes to lie anterior and inferior to the Posterior Cruciate Ligament (PCL). On a sagittal MRI slice, this fragment mimics the appearance of the PCL, creating a "double" contour. ### Why Other Options are Incorrect * **Lateral Meniscus Tear:** While bucket-handle tears can occur in the lateral meniscus, they rarely produce a "Double PCL" sign. This is because the Anterior Cruciate Ligament (ACL) usually prevents the lateral meniscus fragment from displacing far enough medially to sit in front of the PCL. * **PCL Tear:** A PCL tear would result in a loss of the ligament's normal taut, dark signal or a frank discontinuity, rather than a duplication of the structure. * **ACL Tear:** While ACL tears are frequently associated with meniscal injuries, the "Double PCL" sign specifically requires an intact ACL. If the ACL is torn, the displaced meniscal fragment may sit in a different position, and the classic "double" appearance is often lost. ### High-Yield Clinical Pearls for NEET-PG * **Specificity:** The Double PCL sign has a specificity of nearly 100% for a medial bucket-handle tear. * **Prerequisite:** For this sign to be visible, the **ACL must be intact**. * **Other Meniscal Signs:** * **Fragment-in-notch sign:** General term for a displaced meniscal fragment. * **Double Delta sign:** Seen in displaced tears of the lateral meniscus. * **Absent bow-tie sign:** Suggests a bucket-handle tear when fewer than two sagittal slices show a normal meniscal body.

Q: Which is the earliest radiologic feature of bone infection?

Soft tissue edema. **Explanation:** In the context of acute osteomyelitis, the earliest radiologic changes are subtle and involve the surrounding soft tissues rather than the bone itself. **1. Why Soft Tissue Edema is Correct:** Soft tissue swelling and the obliteration of normal fat planes are the **earliest** radiographic signs, typically appearing within **3 to 5 days** of the onset of infection. This occurs because the inflammatory process causes localized hyperemia and fluid accumulation in the soft tissues adjacent to the infected bone before significant mineral loss occurs in the bone matrix. **2. Why the Other Options are Incorrect:** * **Destructive Lytic Lesion:** Bone destruction (radiolucency) only becomes visible on a plain X-ray after **30% to 50%** of the bone mineral content has been lost. This process usually takes **7 to 14 days** in children and even longer in adults. * **Periosteal Reaction:** This represents the bone's attempt to heal or contain the infection. It typically appears **10 to 14 days** after the initial insult as the lifting of the periosteum by pus or edema leads to new bone formation. * **Appearance of Sequestra:** A sequestrum (a piece of dead bone detached from healthy bone) is a feature of **chronic osteomyelitis**. It takes weeks to develop and is never an early sign. **Clinical Pearls for NEET-PG:** * **Earliest Imaging Modality:** While X-ray shows soft tissue edema first, **MRI** is the most sensitive and earliest imaging modality overall (detecting changes within 24–48 hours). * **Triple Phase Bone Scan:** Shows increased uptake in all three phases; it is highly sensitive but less specific than MRI. * **Sequence of X-ray findings:** Soft tissue swelling (3-5 days) → Periosteal reaction (7-10 days) → Lytic destruction (14 days).

Q: The radiographic finding of the left maxilla indicates which of the following?

Fibrous dysplasia. ***Fibrous dysplasia*** - Presents with characteristic **ground-glass** or **orange-peel** radiographic appearance in the maxilla due to replacement of normal bone with fibrous tissue and immature woven bone. - Commonly affects the **craniofacial bones**, particularly the maxilla, causing painless facial asymmetry and expansion. *Paget's disease* - Shows classic **cotton-wool** appearance on radiographs with mixed lytic and sclerotic changes, not the ground-glass pattern. - Typically affects **older adults** (>50 years) and involves multiple bones including pelvis, spine, and long bones. *Hyperparathyroidism* - Radiographic features include **salt-and-pepper skull** pattern and **brown tumors** (lytic lesions), not ground-glass appearance. - Associated with **elevated serum calcium** and **parathyroid hormone levels** causing generalized bone demineralization. *Osteoma* - Appears as a **dense, sclerotic lesion** with well-defined borders, completely opposite to the ground-glass pattern. - Typically occurs in **paranasal sinuses** and presents as a homogeneous, radiopaque mass without internal trabecular pattern.

Q: An 'H' shaped vertebra is characteristic of which condition?

Sickle cell anemia. **Explanation:** The **'H' shaped vertebra** (also known as **Reynold’s sign** or Codfish vertebra) is a classic radiological hallmark of **Sickle Cell Anemia**. **Why it occurs:** The deformity is caused by **microvascular occlusion** of the small end-arteries (branches of the nutrient artery) that supply the central portion of the vertebral endplates. This leads to chronic ischemia and infarction of the central endplate, resulting in impaired growth and central depression. The peripheral parts of the endplate, supplied by the periosteal vessels, continue to grow normally. This creates a characteristic "steplike" central depression, giving the vertebral body an 'H' shape on a lateral radiograph. **Analysis of Incorrect Options:** * **Phenylketonuria:** This is a metabolic disorder of amino acid metabolism; it does not typically present with specific vertebral structural deformities. * **Hemangioma:** Characterized by the **"Corduroy cloth"** or **"Jail-bar"** appearance due to the thickening of vertical trabeculae. * **Osteoporosis:** Leads to generalized osteopenia and **"Codfish vertebrae"** (biconcave appearance), but it lacks the specific sharp, steplike central depression seen in Sickle Cell Anemia. **NEET-PG High-Yield Pearls:** * **Sickle Cell Anemia (Skeletal):** Look for "Hair-on-end" appearance of the skull, "Fish-mouth" vertebrae, and dactylitis (Hand-foot syndrome). * **Thalassemia:** Also shows "Hair-on-end" skull but typically presents with **"Salt and Pepper"** skull and expansion of facial bones (Chipmunk facies). * **Differential for H-shaped vertebra:** While most common in Sickle Cell, it can occasionally be seen in **Gaucher’s disease** and **Thalassemia major**.

Question 1

A 60-year-old man presents with bone pain and fatigue. His skull X-ray is shown in the image. This appearance is most suggestive of which of the following conditions?

Accepted Answer

Multiple myeloma

Answer

Eosinophilic granuloma

Answer

Hyperparathyroidism

Answer

Acromegaly

Question 2

On X-ray, joint swelling and intra-articular calcification appearance is seen in which condition?

Accepted Answer

Charcot's joint

Answer

Osteopetrosis

Answer

Paget's disease

Answer

Rheumatoid arthritis

Question 3

Ankylosis of the temporomandibular joint (TMJ) can be best visualized in which radiographic view?

Accepted Answer

Transcranial view

Answer

Lateral oblique view

Answer

Lateral view

Answer

Posterior-anterior (PA) view

Question 4

Which of the following is NOT a radiological feature of scleroderma?

Accepted Answer

Bullet shaped vertebra

Answer

Acroosteolysis

Answer

Calcinosis

Answer

Erosion of superior aspect of ribs

Question 5

X-ray skull characteristically shows "Hair on end" appearance in which of the following diseases?

Accepted Answer

Neuroblastoma

Answer

Still's disease

Answer

Scurvy

Answer

Cirrhosis of liver

Question 6

What is shown in the X-ray skull?

Accepted Answer

Punched-out (raindrop) skull appearance

Answer

Mug shot with pellets

Answer

Artifacts

Answer

Silver-beaten appearance

Question 7

The "Double PCL" sign on MRI knee is typically seen in which of the following conditions?

Accepted Answer

Medial meniscus tear

Answer

Lateral meniscus tear

Answer

PCL tear

Answer

ACL tear

Question 8

Which is the earliest radiologic feature of bone infection?

Accepted Answer

Soft tissue edema

Answer

Destructive lytic lesion

Answer

Presence of periosteal reaction

Answer

Appearance of sequestra

Question 9

The radiographic finding of the left maxilla indicates which of the following?

Accepted Answer

Fibrous dysplasia

Answer

Paget’s disease

Answer

Hyperparathyroidism

Answer

Osteoma

Question 10

An 'H' shaped vertebra is characteristic of which condition?

Accepted Answer

Sickle cell anemia

Answer

Phenylketonuria

Answer

Hemangioma

Answer

Osteoporosis

Musculoskeletal Radiology — MCQs

Musculoskeletal Radiology — MCQs

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