Musculoskeletal Radiology Practice Questions

Q: Radiological appearance of rickets includes all of the following except?

Pelkan spur. **Explanation:** The correct answer is **D. Pelkan spur**. This is because Pelkan spurs are a characteristic radiological feature of **Scurvy (Vitamin C deficiency)**, not Rickets. **Understanding the Pathology:** * **Rickets (Vitamin D deficiency):** The primary pathology is a failure of osteoid mineralization at the growth plate. This leads to an accumulation of unmineralized matrix, causing the growth plate to widen and the metaphysis to become soft and deformed under mechanical stress. * **Scurvy:** The pathology involves defective collagen synthesis, leading to capillary fragility and subperiosteal hemorrhages. A **Pelkan spur** is a bony outgrowth at the metaphyseal margin caused by the healing of these subperiosteal hemorrhages or the outward protrusion of the "Trummerfeld zone." **Analysis of Options in Rickets:** * **A. Fraying:** Refers to the hazy, thread-like appearance of the metaphyseal margin due to disorganized mineralization. * **B. Cupping:** The metaphysis assumes a concave, cup-like shape as it is pushed against the soft, uncalcified epiphysis. * **C. Splaying:** The widening of the metaphysis due to the lateral expansion of the unmineralized osteoid. **NEET-PG High-Yield Pearls:** 1. **Rickets Key Signs:** Fraying, Cupping, Splaying, Widened growth plate, and **Rachitic Rosary** (enlarged costochondral junctions). 2. **Scurvy Key Signs:** **Wimberger’s ring** (sclerotic epiphysis), **Frankel’s line** (dense zone of provisional calcification), **Trummerfeld zone** (lucent scorbutic zone), and **Pelkan spurs**. 3. **Earliest sign of Rickets:** Fraying and widening of the growth plate, most commonly seen at the **distal radius and ulna**.

Q: Which of the following is NOT a radiological finding of hemophilic arthropathy?

Shortening of intercondylar notch of the knee. **Explanation:** Hemophilic arthropathy is a chronic joint deformity resulting from recurrent intra-articular bleeding (hemarthrosis). The pathophysiology involves synovial hypertrophy and iron (hemosiderin) deposition, which leads to hypervascularity and cartilage destruction. **Why Option C is correct:** In hemophilic arthropathy of the knee, the **intercondylar notch actually becomes widened (not shortened)**. This occurs because the hypertrophied synovium and chronic inflammation within the notch cause pressure erosion and remodeling of the femoral condyles. **Why the other options are incorrect:** * **A. Patellar squaring:** Chronic hyperemia leads to premature fusion of the growth plates and abnormal remodeling. Squaring of the inferior pole of the patella (Jordan’s sign) is a classic radiological hallmark. * **B. Subchondral cysts:** Recurrent bleeding into the subchondral bone leads to the formation of multiple radiolucent cysts (Geodes), often larger than those seen in osteoarthritis. * **D. Epiphyseal overgrowth:** Increased blood flow (hyperemia) to the joint during the skeletal growth phase causes the epiphyses to enlarge and mature prematurely, often leading to limb length discrepancy. **NEET-PG High-Yield Pearls:** * **Target Joint:** The knee is the most commonly affected joint in hemophilia. * **Arnold-Hilgartner Classification:** Used to stage the severity of hemophilic arthropathy based on X-ray findings. * **MRI:** The gold standard for early detection; it shows **"blooming" artifact** on Gradient Echo (GRE) sequences due to the paramagnetic effect of hemosiderin. * **Differential Diagnosis:** Widened intercondylar notch is also seen in **Juvenile Idiopathic Arthritis (JIA)**, but the presence of dense joint effusions (due to iron) favors hemophilia.

Q: All of the following are features of Achondroplasia except?

Wimberger ring sign. **Explanation:** **Achondroplasia** is the most common cause of short-limb dwarfism (rhizomelic shortening). It is an autosomal dominant condition caused by a mutation in the **FGFR3 gene**, leading to impaired endochondral ossification. **Why Wimberger Ring Sign is the correct answer:** The **Wimberger ring sign** is a classic radiological feature of **Scurvy (Vitamin C deficiency)**. It refers to a thin, sclerotic rim surrounding a lucent center in the epiphysis (circular demineralization). It is not associated with achondroplasia. **Analysis of other options (Features of Achondroplasia):** * **Bullet-shaped vertebra:** Seen in the lumbar spine due to anterior wedging/hypoplasia of the vertebral bodies. This often leads to progressive kyphosis and a narrowed interpedicular distance (pathognomonic finding). * **Trident hand:** Characterized by a persistent space between the third and fourth digits, with short, stubby fingers of nearly equal length, resembling a "starfish" or a "trident." * **Champagne glass pelvis:** The pelvis is short and broad with a "square" appearance of the iliac wings (Elephant ear ilia) and a flat, wide pelvic inlet resembling a champagne glass. **High-Yield Clinical Pearls for NEET-PG:** * **Inheritance:** Autosomal Dominant (80% are new mutations related to advanced paternal age). * **Skull:** Frontal bossing with midface hypoplasia and a narrowed foramen magnum (risk of sudden infant death). * **Long Bones:** Rhizomelic shortening (proximal segments like humerus/femur are most affected). * **Differential for Wimberger Sign:** Do not confuse this with **Wimberger’s Sign** (localized erosion of the medial proximal tibial metaphysis), which is seen in **Congenital Syphilis**.

Q: Which radiographic view is best for visualizing condylar and ramus fractures?

Reverse Towne's view. **Explanation:** The **Reverse Towne’s view** is the gold standard radiographic projection for visualizing the **mandibular condyles and the ramus**. In this view, the patient is prone with the forehead and nose touching the film, and the X-ray beam is angled cephalad. This positioning causes the condyles to be projected clear of the mastoid processes and the petrous ridges of the temporal bone, providing an unobstructed view of the condylar necks and the ascending ramus. It is particularly useful for detecting medial or lateral displacement of condylar fractures. **Analysis of Incorrect Options:** * **Caldwell View (Occipitofrontal):** Best for visualizing the **frontal sinuses**, orbital rims, and the ethmoid air cells. The petrous ridges overlap the lower third of the orbit in this view. * **Towne’s View (AP Axial):** While similar, the standard Towne’s view is an AP projection used primarily to visualize the **occipital bone** and the zygomatic arches. For mandibular fractures, the "Reverse" (PA) version is preferred as it provides better detail of the condyles with less magnification. * **Water’s View (Occipitomental):** The primary view for **maxillary sinuses**. It is also excellent for evaluating the orbital floor (blow-out fractures) and the zygomatico-maxillary complex (ZMC) fractures. **High-Yield Clinical Pearls for NEET-PG:** * **Mandible Fractures:** The most common site is the **body**, followed by the **condyle**. * **Subcondylar Fractures:** Often result from a blow to the chin (indirect force). * **Imaging Choice:** While Reverse Towne's is the best plain film, **NCCT with 3D reconstruction** is now the gold standard for complex maxillofacial trauma. * **OPG (Orthopantomogram):** The best screening radiograph for the entire mandible.

Q: The following X-ray has a feature which is characteristic of which condition?

Osteoarthritis. ***Osteoarthritis*** - Characteristic X-ray features include **joint space narrowing**, **osteophytes** (bone spurs), **subchondral sclerosis**, and **subchondral cysts**. - Typically affects **weight-bearing joints** like knees and hips, showing asymmetric joint involvement with preserved bone density. *Rheumatoid arthritis* - X-ray shows **symmetric joint involvement** with **periarticular osteopenia** and **joint erosions** at margins. - Features include **joint space narrowing** without osteophytes and **swan neck** or **boutonniere deformities** in hands. *Ankylosing spondylitis* - Characteristic **bamboo spine** appearance with **syndesmophytes** connecting vertebral bodies. - Shows **sacroiliac joint fusion** and **squaring of vertebral bodies**, typically affecting the axial skeleton. *Psoriatic arthritis* - X-ray demonstrates **pencil-in-cup deformity** and **asymmetric joint involvement** with **dactylitis**. - Features include **enthesitis** with bone proliferation and **distal interphalangeal joint** involvement unlike rheumatoid arthritis.

Q: Which one of the following is a recognized X-ray feature of rheumatoid arthritis?

Bone erosions. **Explanation:** Rheumatoid Arthritis (RA) is a chronic, systemic inflammatory disease primarily characterized by symmetric polyarthritis. The hallmark of RA on imaging is the destruction of joint components due to inflammatory **pannus** formation. **Why "Bone Erosions" is correct:** In RA, the synovial membrane becomes inflamed and hypertrophied (pannus). This pannus releases proteolytic enzymes that digest cartilage and bone. The earliest radiographic changes occur at the **"bare areas"**—regions within the joint capsule where the bone is not covered by protective articular cartilage. These **marginal erosions** are a classic diagnostic feature of RA, typically seen first in the MCP and PIP joints of the hands. **Analysis of Incorrect Options:** * **A. Juxta-articular osteosclerosis:** This is a feature of **Osteoarthritis (OA)**. In RA, the characteristic finding is actually juxta-articular **osteopenia** (decreased bone density) due to increased local blood flow and inflammatory cytokines. * **B. Sacroiliitis:** This is the hallmark of **Seronegative Spondyloarthropathies** (e.g., Ankylosing Spondylitis). RA typically spares the sacroiliac joints and the thoracolumbar spine, though it frequently involves the cervical spine (atlantoaxial subluxation). * **D. Peri-articular calcification:** This is commonly seen in metabolic conditions like **CPPD (Pseudogout)** or Scleroderma, but is not a feature of RA. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest X-ray sign of RA:** Soft tissue swelling. * **Earliest bone sign:** Juxta-articular osteopenia (rarefaction). * **Classic Hand Findings:** Symmetric joint space narrowing, marginal erosions, and late-stage deformities (Swan neck, Boutonniere, and Ulnar deviation). * **Joints Spared:** RA typically spares the **Distal Interphalangeal (DIP) joints**, which are instead involved in OA and Psoriatic Arthritis.

Q: Phleboliths are typically seen in which of the following locations?

Cavernous Hemangiomas. ### Explanation **Correct Answer: C. Cavernous Hemangiomas** **Understanding Phleboliths** Phleboliths are small, rounded calcifications within a vein, resulting from the calcification of a localized thrombus. They are a hallmark radiographic feature of **slow-flow vascular malformations**, most notably **Cavernous Hemangiomas**. In these lesions, stagnant blood flow leads to thrombus formation, which subsequently undergoes dystrophic calcification. On imaging (X-ray or CT), they appear as focal, radiopaque densities, often with a characteristic "lucent center." **Analysis of Incorrect Options:** * **A. Dental Pulp:** Calcifications here are known as **Pulp Stones** (denticles). They are associated with aging or chronic irritation but are not venous in origin. * **B. Salivary Gland Duct:** Calcifications in the salivary system are called **Sialoliths**. These are typically composed of calcium phosphate and form due to salivary stasis or inflammation within the ductal system (most common in the Submandibular gland). * **D. Subepithelial Bulla:** This refers to a fluid-filled blister (seen in conditions like Pemphigoid). While they may scar or secondarily infect, they do not characteristically form phleboliths. **NEET-PG High-Yield Pearls:** * **Pelvic Phleboliths:** Extremely common on abdominal X-rays. They are located below the level of the ischial spines and must be differentiated from **ureteric calculi** (which are usually higher and more medial). * **Soft Tissue Hemangiomas:** The presence of phleboliths in a soft tissue mass is a highly specific diagnostic sign for a hemangioma. * **Maffucci Syndrome:** A rare disorder characterized by multiple enchondromas and soft tissue hemangiomas containing phleboliths. * **Imaging Appearance:** On CT, phleboliths often show a "tail sign" (a tapering soft tissue extension representing the parent vein).

Question 1

What are the radiological changes observed in Rickets?

Accepted Answer

Narrowing or absence of the normal zone of provisional calcification

Answer

Fracture of the bone

Answer

Epiphysis smaller than normal with characteristic thin pencil line appearance

Answer

Bowing of the bone

Question 2

Radiological appearance of rickets includes all of the following except?

Accepted Answer

Pelkan spur

Answer

Fraying

Answer

Cupping

Answer

Splaying

Question 3

A "sharpened pencil" appearance of the mandibular condyle on a radiograph indicates which of the following conditions?

Accepted Answer

Rheumatoid arthritis

Answer

Osteoarthritis

Answer

Infectious arthritis

Answer

Juvenile arthritis

Question 4

Which of the following is NOT a radiological finding of hemophilic arthropathy?

Accepted Answer

Shortening of intercondylar notch of the knee

Answer

Patellar squaring

Answer

Subchondral cyst

Answer

Epiphyseal overgrowth

Question 5

All of the following are features of Achondroplasia except?

Accepted Answer

Wimberger ring sign

Answer

Bullet shaped vertebra

Answer

Trident hand/starfish hand

Answer

Champagne glass pelvis

Question 6

Which radiographic view is best for visualizing condylar and ramus fractures?

Accepted Answer

Reverse Towne's view

Answer

Caldwell view

Answer

Towne's view

Answer

Water's view

Question 7

What are the characteristic radiographic changes seen in the alveolar bone?

Accepted Answer

Both monostotic fibrous dysplasia and segmental odontomaxillary dysplasia

Answer

Monostotic fibrous dysplasia

Answer

Hemifacial hyperplasia

Answer

Segmental odontomaxillary dysplasia

Question 8

The following X-ray has a feature which is characteristic of which condition?

Accepted Answer

Osteoarthritis

Answer

Rheumatoid arthritis

Answer

Ankylosing spondylitis

Answer

Psoriatic arthritis

Question 9

Which one of the following is a recognized X-ray feature of rheumatoid arthritis?

Accepted Answer

Bone erosions

Answer

Juxta-articular osteosclerosis

Answer

Sacroiliitis

Answer

Peri-articular calcification

Question 10

Phleboliths are typically seen in which of the following locations?

Accepted Answer

Cavernous Hemangiomas

Answer

Dental Pulp

Answer

Salivary Gland duct

Answer

Subepithelial Bulla

Musculoskeletal Radiology — MCQs

Musculoskeletal Radiology — MCQs

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