Musculoskeletal Radiology Practice Questions

Q: Salt and pepper appearance is seen in intraoral periapical radiographs of which condition?

Thalassemia. **Explanation:** The **"Salt and Pepper" appearance** in intraoral periapical radiographs (IOPA) is a classic radiological sign of **Thalassemia**. **1. Why Thalassemia is correct:** In Thalassemia, chronic hemolytic anemia leads to compensatory **erythroid hyperplasia** of the bone marrow. As the marrow expands to increase red blood cell production, the bony trabeculae in the maxilla and mandible undergo remodeling. This results in a generalized thinning of the trabeculae and an increase in the size of the marrow spaces, creating a granular, mottled radiolucency described as a "salt and pepper" appearance. **2. Why other options are incorrect:** * **Sjogren’s Syndrome:** Characterized radiographically by a **"cherry blossom"** or **"branchless fruit tree"** appearance on sialography due to punctate sialectasis (destruction of salivary acini). * **Periodontal Abscess:** Typically presents as a localized, radiolucent area along the lateral aspect of the root, not a generalized bone pattern. * **Osteoporosis:** While it causes generalized bone thinning, it is characterized by a decrease in the number of trabeculae and cortical thinning (e.g., at the lower border of the mandible), but it is not classically described as "salt and pepper" in a dental context. **3. High-Yield Clinical Pearls for NEET-PG:** * **Skull Radiograph in Thalassemia:** Shows the **"Hair-on-end"** or **"Crew-cut"** appearance due to vertical trabeculations between the inner and outer tables of the skull. * **Facial Features:** Marrow expansion leads to **"Chipmunk Facies"** (prominent cheekbones and protrusion of the maxilla). * **Other "Salt and Pepper" signs:** In general radiology, "Salt and Pepper" appearance on **MRI** is characteristic of **Glomus tumors (Paragangliomas)**, where "pepper" represents flow voids and "salt" represents hemorrhage/slow flow.

Q: An X-ray of the right distal tibia and fibula is shown. What condition does it possibly represent?

Osteosarcoma. ***Osteosarcoma*** - Typically presents as a **mixed lytic-sclerotic lesion** in the **metaphyseal region** of long bones, commonly affecting the distal femur or proximal tibia - Classic radiographic features include **Codman's triangle** (periosteal elevation) and **sunburst pattern** (radiating spicules of bone) *Ewing's sarcoma* - Predominantly affects the **diaphyseal region** of long bones, not the metaphysis like osteosarcoma - Characteristic **onion-skin appearance** due to laminated periosteal reaction, distinct from osteosarcoma's sunburst pattern *Soft tissue tumor with fibular involvement* - Soft tissue tumors typically show **soft tissue mass** without primary bone destruction or formation - Would not demonstrate the **aggressive bone formation** and **sclerotic changes** typical of primary bone tumors *Osteoclastoma* - Also known as **giant cell tumor (GCT)**, typically occurs in the **epiphyseal region** of long bones - Presents as a **soap-bubble appearance** with well-defined lytic lesions, lacking the mixed sclerotic pattern of osteosarcoma

Q: Which of the following is the most probable diagnosis given the provided X-ray?

Fluorosis. ***Fluorosis*** - **Osteosclerosis** with increased bone density and **calcification of ligaments and tendons** are pathognomonic X-ray features of skeletal fluorosis. - **Calcified interosseous membranes** between radius-ulna and tibia-fibula create characteristic "bamboo spine" appearance in advanced cases. *Caffey's disease* - Presents with **cortical hyperostosis** and **periosteal new bone formation** primarily affecting long bones in infants. - X-rays show **thickened cortices** with **soft tissue swelling**, not the diffuse sclerosis seen in fluorosis. *Rickets* - Characterized by **osteopenia**, **delayed ossification**, and **metaphyseal changes** like cupping and fraying. - X-rays show **bowing deformities**, **coxa vara**, and **widened growth plates**, opposite to the sclerotic changes in fluorosis. *Scurvy* - Shows **osteopenia** with **cortical thinning** and **metaphyseal corner fractures** (Pelkan's sign). - **Wimberger's ring** around metaphyses and **ground glass osteopenia** are typical, contrasting with fluorosis's increased density.

Q: The "salt and pepper" appearance of the skull is typically seen in which of the following conditions?

Hyperparathyroidism. **Explanation:** The "salt and pepper" appearance of the skull (also known as the pepper pot skull) is a classic radiological sign of **Hyperparathyroidism**. **1. Why Hyperparathyroidism is Correct:** In hyperparathyroidism, excess parathyroid hormone (PTH) stimulates osteoclastic activity, leading to diffuse bone resorption. In the calvarium, this manifests as multiple small, lucent areas (the "pepper") interspersed with areas of relatively preserved bone (the "salt"). This loss of definition between the inner and outer tables of the skull creates a granular, mottled appearance. **2. Analysis of Incorrect Options:** * **Multiple Myeloma:** Characterized by **"punched-out" lytic lesions**. These are sharply defined, circular lucencies without a sclerotic rim, unlike the diffuse, granular mottling of hyperparathyroidism. * **Sickle Cell Anemia:** Shows a **"hair-on-end" appearance** (or crew-cut sign). This is due to compensatory extramedullary hematopoiesis causing widening of the diploic space and vertical trabeculations. * **Fibrous Dysplasia:** Typically presents with a **"ground-glass" opacification** due to the replacement of normal bone with fibrous tissue and immature bone. **3. High-Yield Clinical Pearls for NEET-PG:** * **Subperiosteal bone resorption** is the most specific radiological sign of hyperparathyroidism, most commonly seen on the **radial aspect of the middle phalanges** of the 2nd and 3rd fingers. * Other signs include **Brown tumors** (osteoclastomas) and the **"Rugger-jersey spine"** (seen in secondary hyperparathyroidism/renal osteodystrophy). * **Distinction:** Do not confuse "Salt and Pepper Skull" (Hyperparathyroidism) with "Salt and Pepper Noise" on MRI (seen in Paragangliomas/Glomus tumors).

Q: The 'Pelkan spur' is a radiological feature of which of the following conditions?

Scurvy. **Explanation:** The **Pelkan spur** is a classic radiological sign of **Scurvy** (Vitamin C deficiency). Scurvy leads to defective collagen synthesis, resulting in fragile capillary walls and impaired osteoid formation. The Pelkan spur refers to lateral bony projections (osteophytes) seen at the metaphysis. These occur due to the outward extension of the **Zone of Provisional Calcification** (Frankel’s line) and are often associated with healing metaphyseal fractures or subperiosteal hemorrhages. **Analysis of Options:** * **Scurvy (Correct):** In addition to Pelkan spurs, other high-yield features include **Wimberger’s ring** (sclerotic rim around an osteoporotic epiphysis), **Frankel’s line** (dense metaphyseal band), and the **Trummerfeld zone** (lucent scorbutic zone proximal to the dense line). * **Rickets:** Characterized by "Cupping, Fraying, and Splaying" of the metaphysis, delayed ossification, and widening of the growth plate. It does not feature Pelkan spurs. * **Hemophilia:** Radiological findings typically involve joint destruction (hemophilic arthropathy), widened intercondylar notches in the femur, and "squared-off" patella due to chronic hemarthrosis. **NEET-PG High-Yield Pearls for Scurvy:** 1. **Early Sign:** Generalized osteopenia. 2. **White Line of Frankel:** Represents a thickened zone of provisional calcification. 3. **Subperiosteal Hemorrhage:** Leads to lifting of the periosteum, which becomes visible as it calcifies during healing. 4. **Clinical Triad:** Anemia, Gum bleeding, and Bone pain.

Q: Tufting of the distal phalanx is characteristically seen in which condition?

Psoriatic arthropathy. **Explanation:** **Psoriatic arthropathy (Option B)** is the correct answer because it characteristically involves the distal interphalangeal (DIP) joints and the distal phalanges. **Tufting of the distal phalanx** (also known as acro-osteolysis or resorption of the terminal tuft) occurs due to inflammatory bone destruction. In Psoriatic Arthritis, this is often associated with the "pencil-in-cup" deformity and "sausage digit" (dactylitis). **Analysis of Incorrect Options:** * **Gout (Option A):** Characterized by "punched-out" erosions with overhanging edges (**Martel’s sign**) and soft tissue tophi. It typically spares the terminal tufts. * **Hypoparathyroidism (Option C):** Usually presents with increased bone density (osteosclerosis) or basal ganglia calcification. It is **Hyperparathyroidism** that causes subperiosteal bone resorption, often seen on the radial aspect of the middle phalanges, not specifically tufting. * **Paget’s Disease (Option D):** Characterized by bone enlargement, cortical thickening, and coarsened trabeculae. While it can affect any bone, it does not typically cause distal phalangeal tufting. **High-Yield Clinical Pearls for NEET-PG:** * **Acro-osteolysis (Tufting resorption) Differential:** Remember the mnemonic **"P-S-C-H-O"**: **P**soriasis, **S**cleroderma (most common cause due to digital ischemia), **C**apital (Vinyl Chloride exposure), **H**yperparathyroidism, and **O**steomyelitis. * **Psoriatic Arthritis X-ray Triad:** DIP joint involvement, asymmetric distribution, and periosteal new bone formation. * **Pencil-in-cup deformity:** Classic finding where the proximal phalanx erodes into a point (pencil) and the distal phalanx base hollows out (cup).

Q: Bullet shaped vertebrae are seen in all of the following conditions, EXCEPT:

Paget disease. **Explanation:** **Bullet-shaped vertebrae** (also known as anterior wedging or tongue-like projections of the vertebrae) are a classic radiological sign characterized by the hypoplasia of the anterosuperior portion of the vertebral body, leading to a rounded or "bullet" appearance. **Why Paget Disease is the Correct Answer:** Paget disease of the bone is characterized by excessive bone remodeling. Radiologically, it presents as **"Picture Frame" vertebrae** (due to peripheral cortical thickening) or **"Ivory" vertebrae** (diffuse sclerosis). It does not cause the developmental anterior wedging seen in bullet-shaped vertebrae. **Analysis of Incorrect Options:** * **Hurler Syndrome (MPS I):** This is the classic cause. It typically involves the **L1 or L2** vertebrae, showing an inferior "beak" or tongue-like projection. * **Morquio Syndrome (MPS IV):** Characterized by universal platyspondyly (flattened vertebrae) with a **central anterior beak**. * **Achondroplasia:** This common cause of dwarfism features bullet-shaped vertebrae in the upper lumbar spine, often associated with posterior scalloping and narrowing of the interpedicular distance. **High-Yield Clinical Pearls for NEET-PG:** * **Inferior Beaking:** Hurler Syndrome, Hunter Syndrome. * **Central Beaking:** Morquio Syndrome (Pathognomonic). * **Picture Frame/Ivory Vertebra:** Paget Disease, Lymphoma, or Hemangioma (Polka-dot sign). * **Codfish Vertebra:** Osteogenesis Imperfecta or severe Osteoporosis. * **H-shaped Vertebra (Lincoln Log):** Sickle Cell Anemia (due to central endplate infarction).

Q: Stippled epiphysis is seen in which condition?

Congenital Hypothyroidism. **Explanation:** **Stippled epiphysis** (also known as epiphyseal dysgenesis) refers to the appearance of multiple, irregular, punctate calcifications within the cartilaginous epiphysis. 1. **Why Congenital Hypothyroidism is correct:** Thyroid hormone is essential for normal endochondral ossification and skeletal maturation. In congenital hypothyroidism (Cretinism), there is a delay in the appearance of ossification centers. When they finally appear, they do so from multiple small foci rather than a single central nucleus, resulting in a fragmented, "stippled," or "moth-eaten" appearance. This is most commonly seen in the femoral head and the navicular bone. 2. **Why the other options are incorrect:** * **Juvenile Rheumatoid Arthritis:** Characterized by periarticular osteopenia, joint space narrowing, and bony erosions, but not stippled epiphyses. * **Scurvy:** Radiographic features include the Wimberger ring sign (dense periphery of epiphysis), Frankel’s line (dense zone of provisional calcification), and Pelkan spurs. * **Achondroplasia:** Features include rhizomelic shortening of limbs, "trident hand," and narrowing of the interpedicular distance in the lumbar spine. **High-Yield Clinical Pearls for NEET-PG:** * **Differential Diagnosis for Stippled Epiphysis:** 1. **Chondrodysplasia Punctata** (Conradi-Hünermann syndrome) – the classic cause. 2. **Congenital Hypothyroidism.** 3. **Maternal Warfarin ingestion** during pregnancy (Fetal Warfarin Syndrome). 4. **Zellweger Syndrome.** * **Key Sign:** In hypothyroidism, the stippling is a sign of **delayed maturation**, whereas in Chondrodysplasia Punctata, it is a primary calcification disorder.

Q: Disk perforation is best examined by?

Arthrography. ### Explanation **Correct Answer: B. Arthrography** **Why Arthrography is the Correct Choice:** In the context of joint pathology (specifically the Temporomandibular Joint or TMJ), a **disk perforation** refers to a hole in the articular disk that allows the upper and lower joint compartments to communicate. **Arthrography** is considered the gold standard for diagnosing perforations because it involves injecting radiopaque contrast into one compartment (usually the lower). If a perforation exists, the contrast will leak through the disk into the superior compartment. This "flow-through" phenomenon provides direct, functional evidence of a perforation that other modalities may miss. **Analysis of Incorrect Options:** * **A. MRI:** While MRI is the gold standard for diagnosing **disk displacement** (internal derangement) due to its excellent soft-tissue contrast, it has lower sensitivity for detecting small perforations compared to arthrography. * **C. CT Scan:** CT is primarily used to evaluate bony changes (osteophytes, erosions). It does not visualize the non-calcified articular disk or small perforations effectively. * **D. Arthroscopy:** While arthroscopy allows direct visualization of the disk surface, it is an invasive surgical procedure. Arthrography remains the preferred diagnostic investigation for confirming communication between compartments. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard for Disk Displacement:** MRI. * **Gold Standard for Disk Perforation:** Arthrography. * **Double-Contrast Arthrography:** Uses both air and dye to better outline the disk morphology. * **Clinical Sign:** A disk perforation is often associated with **crepitus** (grating sounds) during joint movement, whereas displacement usually presents with a "click."

Question 1

Salt and pepper appearance is seen in intraoral periapical radiographs of which condition?

Accepted Answer

Thalassemia

Answer

Sjogren's syndrome

Answer

Periodontal abscess

Answer

Osteoporosis

Question 2

In Scurvy, Wimberger's sign is best seen in which location?

Accepted Answer

Lower end of femur

Answer

Lower end of radius

Answer

Patella

Answer

Upper end of radius

Question 3

An X-ray of the right distal tibia and fibula is shown. What condition does it possibly represent?

Accepted Answer

Osteosarcoma

Answer

Ewing's sarcoma

Answer

Soft tissue tumor with fibular involvement

Answer

Osteoclastoma

Question 4

Which of the following is the most probable diagnosis given the provided X-ray?

Accepted Answer

Fluorosis

Answer

Caffey's disease

Answer

Rickets

Answer

Scurvy

Question 5

The "salt and pepper" appearance of the skull is typically seen in which of the following conditions?

Accepted Answer

Hyperparathyroidism

Answer

Multiple myeloma

Answer

Sickle cell anemia

Answer

Fibrous dysplasia

Question 6

The 'Pelkan spur' is a radiological feature of which of the following conditions?

Accepted Answer

Scurvy

Answer

Rickets

Answer

Hemophilia

Answer

None of the above

Question 7

Tufting of the distal phalanx is characteristically seen in which condition?

Accepted Answer

Psoriatic arthropathy

Answer

Gout

Answer

Hypoparathyroidism

Answer

Paget's disease

Question 8

Bullet shaped vertebrae are seen in all of the following conditions, EXCEPT:

Accepted Answer

Paget disease

Answer

Hurler syndrome

Answer

Morquio syndrome

Answer

Achondroplasia

Question 9

Stippled epiphysis is seen in which condition?

Accepted Answer

Congenital Hypothyroidism

Answer

Juvenile Rheumatoid Arthritis

Answer

Scurvy

Answer

Achondroplasia

Question 10

Disk perforation is best examined by?

Accepted Answer

Arthrography

Answer

MRI

Answer

CT scan

Answer

Arthroscopy

Musculoskeletal Radiology — MCQs

Musculoskeletal Radiology — MCQs

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