Musculoskeletal Radiology Practice Questions

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

Cupping of bone ends. **Explanation:** The correct answer is **D. Cupping of bone ends**. This is because cupping, fraying, and splaying of the metaphysis are hallmark radiological features of **Rickets**, not Scurvy. In Rickets, the failure of osteoid mineralization leads to a "cup-shaped" deformity due to the pressure of the adjacent epiphysis on the softened metaphysis. **Analysis of Scurvy (Vitamin C Deficiency) Features:** Scurvy is characterized by a defect in collagen synthesis, leading to capillary fragility and impaired osteoid formation, while calcification of cartilage remains intact. * **White line of Fraenkel (Option B):** This represents a dense, radiopaque line at the metaphysis due to an accumulation of calcified cartilage matrix (as it cannot be converted to bone). * **Zone of Rarefaction (Option C):** Also known as the **Trümmerfeld zone**, this is a lucent band located just proximal to the White line of Fraenkel, representing a site of weakened, fractured trabeculae. * **Pencil line changes (Option A):** This refers to the thinning of the cortex, making the bone appear transparent with a sharp, thin peripheral outline like a pencil sketch. **High-Yield Clinical Pearls for NEET-PG:** * **Wimberger’s Sign:** A dense radiopaque halo surrounding a lucent center in the epiphysis. * **Pelkan Spur:** Lateral bony outgrowths at the metaphysis due to healing of subperiosteal hemorrhages. * **Subperiosteal Hemorrhage:** The most specific clinical sign, though not visible on X-ray until healing begins (elevation of periosteum). * **Key Differentiator:** Scurvy presents with **increased density** (White line), whereas Rickets presents with **decreased density** (Fraying/Cupping).

Q: Which of the following investigations is NOT useful in Multiple Myeloma?

BONE SCAN. **Explanation:** The correct answer is **Bone Scan (Technetium-99m MDP)**. **1. Why Bone Scan is NOT useful:** Multiple Myeloma is characterized by **purely lytic lesions** caused by increased osteoclast activity and the suppression of osteoblasts. A traditional Bone Scan (Tc-99m MDP) depends on **osteoblastic activity** (new bone formation) to show "hot spots." Since there is little to no osteoblastic response in myeloma, bone scans often yield **false-negative results**, failing to detect up to 30-50% of lesions. **2. Analysis of other options:** * **MRI (Option B):** This is the **most sensitive** modality for detecting early bone marrow infiltration. It is the gold standard for identifying "smoldering" myeloma and evaluating spinal cord compression. * **CT Scan (Option A):** Low-dose Whole Body CT (WBCT) has replaced the traditional skeletal survey. It is highly effective at detecting small lytic lesions and assessing fracture risks. * **PET Scan (Option D):** FDG-PET/CT is excellent for detecting extramedullary disease and monitoring the response to therapy, as it measures metabolic activity. **Clinical Pearls for NEET-PG:** * **Investigation of Choice (Initial):** Whole Body Low-Dose CT (WBLDCT). * **Most Sensitive for Marrow Infiltration:** MRI. * **Classic Radiographic Sign:** "Punched-out" lytic lesions (especially in the skull). * **The "Cold" Scan:** Remember, Myeloma is a "cold" lesion on a Bone Scan but a "hot" lesion on a PET Scan. * **Exception:** A bone scan may only be positive in Myeloma if there is a healing pathological fracture (which triggers osteoblasts).

Q: Which of the following is not a radiological feature of rickets?

Frenkel's line. **Explanation:** The correct answer is **Frenkel’s line**, which is a radiological hallmark of **Scurvy (Vitamin C deficiency)**, not Rickets. Frenkel’s line (also known as the "white line of Frankel") represents a dense, irregular zone of provisional calcification at the metaphysis due to the failure of osteoid formation despite continued calcification. **Analysis of Options:** * **Metaphyseal Cupping (Option A):** In Rickets, the lack of mineralization leads to the softening of the metaphysis. Under the pressure of the adjacent epiphysis and weight-bearing, the metaphysis becomes concave or "cup-shaped." * **Physeal Widening (Option B):** This is the earliest radiological sign of Rickets. It occurs due to the failure of mineralization of the zone of provisional calcification, leading to an accumulation of hypertrophic chondrocytes and an increased thickness of the growth plate (physis). * **Triradiate Pelvis (Option D):** This is a late feature of Rickets/Osteomalacia. Softening of the pelvic bones leads to inward protrusion of the acetabulum due to the pressure of the femoral heads, resulting in a characteristic "heart-shaped" or triradiate pelvic outlet. **NEET-PG High-Yield Pearls:** * **Rickets Triad:** Cupping, Splaying, and Fraying of the metaphysis (best seen at the distal radius/ulna). * **Harrison’s Sulcus:** A horizontal groove along the lower border of the thorax corresponding to the insertion of the diaphragm. * **Rachitic Rosary:** Palpable/visible enlargement of the costochondral junctions. * **Scurvy vs. Rickets:** While Rickets features a "frayed" metaphysis, Scurvy features a "dense" metaphysis (Frankel's line), Wimberger’s ring (dense epiphysis), and Pelkan spurs.

Q: The "tongue-in-groove" or "tottering fence post" appearance of the femur is seen in which of the following conditions?

Hyperparathyroidism. ### Explanation The "tongue-in-groove" or "tottering fence post" appearance is a classic radiological sign of **Hyperparathyroidism (HPT)**, specifically seen in the femur. **1. Why Hyperparathyroidism is correct:** In hyperparathyroidism, excess Parathyroid Hormone (PTH) stimulates osteoclastic activity, leading to significant bone resorption. In the femur, this manifests as **subperiosteal and endosteal resorption**. The longitudinal streaks of lucency (resorption) alternating with remaining bone create a pattern resembling a "tongue-in-groove" or a "tottering fence post." This is part of the spectrum of *Osteitis Fibrosa Cystica*. **2. Why other options are incorrect:** * **Fibrous Dysplasia:** Characterized by a **"Ground-glass" matrix** and expansion of bone. It may cause a "Shepherd’s crook" deformity of the femur, but not the fence post appearance. * **Paget’s Disease:** Features include cortical thickening, coarsening of trabeculae, and bone enlargement. Classic signs include the **"Blade of grass"** or "Flame sign" (in long bones) and "Cotton wool" spots (in the skull). * **Fracture neck of femur:** This is a traumatic or pathological break. While HPT can lead to pathological fractures, the specific "tongue-in-groove" description refers to the metabolic resorption pattern, not the fracture itself. **3. High-Yield Clinical Pearls for NEET-PG:** * **Pathognomonic sign of HPT:** Subperiosteal bone resorption, most commonly seen on the **radial aspect of the middle phalanges** of the 2nd and 3rd fingers. * **Skull:** "Salt and pepper" appearance (granular decalcification). * **Spine:** "Rugger-jersey spine" (sclerosis of vertebral endplates). * **Brown Tumors:** Also known as osteoclastomas; these are non-neoplastic lytic lesions filled with fibrous tissue and blood (hemosiderin).

Q: In lead poisoning, where is lead deposition typically seen on a radiograph?

Metaphyseal region. **Explanation:** In pediatric lead poisoning (plumbism), the characteristic radiographic finding is the presence of **"Lead Lines."** These are dense, transverse radiopaque bands located specifically at the **metaphyseal regions** of growing long bones. **Why the Metaphysis?** The metaphysis is the site of most active endochondral ossification. Lead is a divalent cation that mimics calcium; it is absorbed by osteoclasts and deposited in the zone of provisional calcification. Lead inhibits the normal resorption of calcified cartilage, leading to an increased density of the primary spongiosa. It is important to note that the "lead line" is not actually a layer of lead, but rather an area of **increased bone density** resulting from lead-induced metabolic interference. These lines are most prominent in areas of rapid growth, such as the knees (distal femur, proximal tibia) and wrists. **Analysis of Incorrect Options:** * **A. Epiphyseal region:** The epiphysis contains the secondary ossification centers. While lead can affect growth, it does not typically deposit in a linear radiopaque fashion here. * **C. Diaphyseal region:** The diaphysis (shaft) consists of mature cortical bone. Lead lines are a phenomenon of the growth plate transition zone, which the diaphysis lacks. * **D. Any of the above:** Lead deposition is highly site-specific to the metaphysis in growing children. **High-Yield Clinical Pearls for NEET-PG:** * **Lead Lines:** Usually appear when blood lead levels exceed **70–80 μg/dL**. * **Differential Diagnosis:** Similar metaphyseal bands can be seen in healing rickets, phosphorus poisoning, bismuth ingestion, or treated leukemia. * **Other Radiographic Signs:** In chronic ingestion, look for **radiopaque flecks** in the GI tract (pica). * **Clinical Triad:** Encephalopathy, abdominal colic, and microcytic hypochromic anemia with **basophilic stippling**.

Q: Looser's zone occurs in which of the following anatomical locations?

All the above. **Explanation:** **Looser’s zones** (also known as pseudofractures, Milkman’s fractures, or cortical infractions) are the pathognomonic radiological hallmark of **Osteomalacia** in adults and **Rickets** in children. 1. **Underlying Concept:** These are not true fractures but represent stress fractures where the damaged bone is replaced by **unmineralized osteoid** (soft, poorly calcified bone matrix) rather than mature bone. On an X-ray, they appear as thin, transverse radiolucent lines perpendicular to the cortex, often with sclerotic margins. 2. **Anatomical Locations:** They typically occur at sites of mechanical stress or where major arteries cross the bone. Common locations include: * **Pubic rami** (most common site). * **Femoral neck** and medial aspect of the proximal femur. * **Ribs** and the axillary margin of the **scapula**. * Other sites include the ulna, radius, and fibula. * Since all options (A, B, and C) are classic sites for these lesions, **Option D (All the above)** is correct. **High-Yield Clinical Pearls for NEET-PG:** * **Pathognomonic for:** Osteomalacia (Adults). * **Radiological appearance:** Transverse lucent bands, often bilateral and symmetrical. * **Biochemical findings in Osteomalacia:** Low/Normal Serum Calcium, Low Serum Phosphate, and **Elevated Alkaline Phosphatase (ALP)**. * **Differential Diagnosis:** Do not confuse Looser's zones with *March fractures* (true stress fractures in normal bone) or *Milkman syndrome* (a specific clinical presentation of osteomalacia).

Q: Sacrotuberous ligament calcification is a characteristic feature of?

Fluorosis. **Explanation:** **Fluorosis** is a chronic metabolic bone disease caused by the ingestion of excessive fluoride, typically through contaminated groundwater. The hallmark of skeletal fluorosis is **osteosclerosis** (increased bone density) and **extensive ligamentous calcification**. The **sacrotuberous ligament** is one of the most characteristic sites for this ectopic calcification, often appearing as a dense, ossified band on a pelvic X-ray. Other commonly affected ligaments include the sacrospinous, iliolumbar, and the posterior longitudinal ligament (leading to spinal stenosis). **Why other options are incorrect:** * **Alkaptonuria (Ochronosis):** Characterized by multi-level **intervertebral disc calcification** and narrowing, often described as "vacuum phenomena" or "wafer-like" calcification. It does not typically target the sacrotuberous ligament. * **Osteopetrosis:** A genetic disorder of defective osteoclast function leading to "marble bone disease." While it causes diffuse sclerosis and a "bone-within-bone" appearance, it does not typically cause ligamentous calcification. * **Pseudogout (CPPD):** Characterized by **chondrocalcinosis** (calcification of hyaline and fibrocartilage), most commonly in the knees (menisci), wrists (TFCC), and symphysis pubis, rather than pelvic ligaments. **High-Yield Clinical Pearls for NEET-PG:** * **Radiological Triad of Fluorosis:** Osteosclerosis (spine/pelvis), Osteophytosis, and Ligamentous/Tendon calcification. * **Early Sign:** Roughening and blurring of the trabecular pattern in the pelvis and lumbar spine. * **D/D for Diffuse Osteosclerosis:** Fluorosis, Osteopetrosis, Myelofibrosis, and Sclerotic bone metastases (e.g., Prostate CA). * **Key differentiator:** Fluorosis is the most likely diagnosis when diffuse sclerosis is accompanied by exuberant ligamentous ossification.

Q: What is the likely diagnosis given this radiological appearance?

Acromegaly. ***Acromegaly*** - Classic radiological features include **enlarged sella turcica**, **tufting of terminal phalanges**, and **widened joint spaces** due to excessive growth hormone. - Additional findings include **heel pad thickening** (>25mm) and **enlarged mandible** with prognathism. *Rickets* - Characterized by **metaphyseal cupping** and **fraying** at the ends of long bones due to defective mineralization. - Shows **coxa vara**, **bowing deformities**, and **delayed ossification** of epiphyses, not the features described. *Thalassemia* - Demonstrates **hair-on-end skull** appearance due to extramedullary hematopoiesis and bone marrow expansion. - Shows **Erlenmeyer flask deformity** of long bones and **hepatosplenomegaly**, distinct from acromegaly features. *Osteopetrosis* - Presents with **dense, marble-like bones** throughout the skeleton due to defective osteoclast function. - Shows **bone-within-bone appearance** and **sandwich vertebrae**, contrasting with the soft tissue and joint changes in acromegaly.

Q: Which of the following interpretations cannot be associated with the given radiograph?

Periapical cemental dysplasia. ***Periapical cemental dysplasia*** - This is a **fibro-osseous lesion** that occurs at the **apex of vital, normally erupted teeth**, typically mandibular incisors and canines, not impacted molars. - It involves **vital teeth with normal pulp** and has no association with **impacted third molars** or their complications. *Recurrent pericoronitis* - Common complication of **impacted third molars** where the **operculum** (gum flap) becomes inflamed and infected. - Radiographically shows **impacted tooth** with possible **bone loss** around the crown area and **radiolucent areas** indicating infection. *Peripheral sclerosing osteitis* - Also known as **condensing osteitis**, it appears as **radiopaque sclerotic bone** around infected or impacted teeth. - Commonly seen around **impacted third molars** as a **reactive bone formation** in response to chronic low-grade infection. *Impacted 3rd molar* - Clearly visible on radiographs as a **tooth that has not erupted** into its normal position. - Shows the **crown and root formation** of the wisdom tooth trapped beneath the **second molar** or **alveolar bone**.

Q: A 60-year-old male reports for denture adjustment. His OPG shows a 1 cm lytic area in the lower bicuspid region. What is the most probable diagnosis?

Any one of the above. ### Explanation The correct answer is **D (Any one of the above)** because a solitary lytic lesion in the mandible of an elderly patient is a non-specific finding that can represent inflammatory, metabolic, or neoplastic processes. **1. Residual Cyst (Option A):** This is an inflammatory odontogenic cyst that remains in the jaw after the tooth has been extracted. Given the patient is 60 years old and seeking denture adjustment, it is highly probable he has missing teeth. A residual cyst appears as a well-defined unilocular radiolucency in an edentulous area. **2. Hyperparathyroidism (Option B):** Primary or secondary hyperparathyroidism leads to increased osteoclastic activity. This can manifest in the jaws as a **"Brown Tumor"** (osteitis fibrosa cystica), which appears as a well-demarcated lytic lesion. Other classic signs include the loss of *lamina dura* around tooth roots and a "salt and pepper" appearance of the skull. **3. Carcinoma of the Prostate (Option C):** While prostate cancer is typically osteoblastic (sclerotic), approximately 5-10% of cases can present as osteolytic or mixed lesions. In an elderly male, any new lytic bone lesion must be evaluated for metastatic disease. The mandible is a known, though less common, site for distant metastasis. ### Clinical Pearls for NEET-PG: * **Most common odontogenic cyst:** Radicular cyst (if the tooth is present) or Residual cyst (if the tooth is extracted). * **Brown Tumor:** Not a true neoplasm; it is a giant cell lesion associated with hyperparathyroidism. * **Metastasis to Jaws:** Most common primary sites are the breast (females) and lung/prostate (males). * **Radiographic Differential for Lytic Jaw Lesions:** Remember the mnemonic **M-A-C-H-O** (Metastasis/Myeloma, Ameloblastoma, Cystic lesions, Hemangioma, Odontogenic keratocyst).

Question 1

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

Accepted Answer

Cupping of bone ends

Answer

Pencil line changes

Answer

White line of Frankel

Answer

Zone of rarefaction

Question 2

Which of the following investigations is NOT useful in Multiple Myeloma?

Accepted Answer

BONE SCAN

Answer

CT SCAN

Answer

MRI

Answer

PET

Question 3

Which of the following is not a radiological feature of rickets?

Accepted Answer

Frenkel's line

Answer

Metaphyseal cupping

Answer

Physeal widening

Answer

Triradiate pelvis

Question 4

The "tongue-in-groove" or "tottering fence post" appearance of the femur is seen in which of the following conditions?

Accepted Answer

Hyperparathyroidism

Answer

Fibrous dysplasia

Answer

Paget's disease

Answer

Fracture neck of femur

Question 5

In lead poisoning, where is lead deposition typically seen on a radiograph?

Accepted Answer

Metaphyseal region

Answer

Epiphyseal region

Answer

Diaphyseal region

Answer

Any of the above

Question 6

Looser's zone occurs in which of the following anatomical locations?

Accepted Answer

All the above

Answer

Pubic rami

Answer

Femoral neck

Answer

Ribs

Question 7

Sacrotuberous ligament calcification is a characteristic feature of?

Accepted Answer

Fluorosis

Answer

Alkaptonuria

Answer

Osteopetrosis

Answer

Pseudogout

Question 8

What is the likely diagnosis given this radiological appearance?

Accepted Answer

Acromegaly

Answer

Rickets

Answer

Thalassemia

Answer

Osteopetrosis

Question 9

Which of the following interpretations cannot be associated with the given radiograph?

Accepted Answer

Periapical cemental dysplasia

Answer

Recurrent pericoronitis

Answer

Peripheral sclerosing osteitis

Answer

Impacted 3rd molar

Question 10

A 60-year-old male reports for denture adjustment. His OPG shows a 1 cm lytic area in the lower bicuspid region. What is the most probable diagnosis?

Accepted Answer

Any one of the above

Answer

Residual cyst

Answer

Hyperparathyroidism

Answer

Carcinoma of the prostate

Musculoskeletal Radiology — MCQs

Musculoskeletal Radiology — MCQs

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