Musculoskeletal Radiology Practice Questions

Q: Which of the following conditions is characterized by the finding shown?

All of the above. ***All of the above*** - All three conditions (tuberculosis, multiple myeloma, and osteogenesis imperfecta) can present with **generalized osteoporosis** or **diffuse osteolytic changes** on radiological imaging. - The shared radiological finding demonstrates **decreased bone density** and **weakened bone architecture** through different pathophysiological mechanisms. *Tuberculosis* - **Skeletal tuberculosis** causes **osteolytic lesions** and bone destruction through chronic granulomatous inflammation and caseous necrosis. - Commonly affects **spine (Pott's disease)** and weight-bearing joints, leading to localized bone loss and osteoporosis. *Multiple myeloma* - Malignant plasma cells produce **osteoclast-activating factors** and suppress osteoblast activity, causing **punched-out lytic lesions**. - Results in **generalized osteoporosis** and **pathological fractures** due to disrupted bone remodeling. *Osteogenesis imperfecta* - Genetic disorder affecting **type I collagen synthesis**, leading to defective bone matrix formation. - Presents with **generalized osteoporosis**, **multiple fractures**, and **thin cortical bones** from birth or early childhood.

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

Diffuse periosteal reaction. **Explanation:** Scleroderma (Systemic Sclerosis) is a multisystem connective tissue disorder characterized by excessive collagen deposition and vascular dysfunction. **Why "Diffuse periosteal reaction" is the correct answer:** Periosteal reaction (new bone formation) is **not** a feature of scleroderma. Scleroderma is primarily characterized by **atrophy and resorption** rather than bone formation. Diffuse periosteal reaction is more commonly associated with conditions like Hypertrophic Osteoarthropathy (HOA), thyroid acropachy, or certain infections and malignancies. **Analysis of other options:** * **Esophageal dysmotility:** This is a hallmark feature. Fibrosis of the smooth muscle leads to a "dilated, aperistaltic esophagus" (often seen as a "glass tube" appearance on barium swallow). * **Erosion of the tip of the phalanges:** Known as **Acro-osteolysis**, this is a classic radiological finding. It results from digital ischemia and pressure from overlying skin tightening (sclerodactyly). * **Lung nodules:** While Interstitial Lung Disease (NSIP pattern) is more common, scleroderma patients have an increased risk of malignancy (Bronchioloalveolar carcinoma) and can develop necrobiotic nodules or silicotic nodules (Erasmus Syndrome). **High-Yield NEET-PG Pearls for Scleroderma:** 1. **Soft Tissue Calcification:** Known as **Calcinosis cutis**, often seen in the fingertips (part of CREST syndrome). 2. **Gastrointestinal:** Widening of the periodontal ligament space and "wide-mouthed" colonic diverticula (pseudodiverticula). 3. **Chest Radiology:** Lower lobe predominant ground-glass opacities or honeycombing (NSIP/UIP patterns) and a dilated esophagus on CT (the "Patulous Esophagus" sign). 4. **Erasmus Syndrome:** The association of silicosis with systemic sclerosis.

Q: In ankylosing spondylitis, what are the first radiological changes seen?

Sacro-iliac joints. **Explanation:** **Ankylosing Spondylitis (AS)** is a chronic inflammatory seronegative spondyloarthropathy that primarily affects the axial skeleton. **1. Why Sacro-iliac (SI) joints are the correct answer:** The hallmark of AS is **bilateral, symmetrical sacroiliitis**. Radiologically, the SI joints are the **earliest** site of involvement. The changes typically begin in the lower two-thirds of the joint (the synovial portion) and progress from subchondral erosions and sclerosis ("pseudowidening") to eventual bony ankylosis (fusion). According to the Modified New York Criteria, radiological evidence of sacroiliitis is essential for a definitive diagnosis. **2. Why the other options are incorrect:** * **Vertebral bodies:** While "squaring" of vertebral bodies (due to enthesitis at the corners) is a classic sign, it occurs after the initial SI joint involvement. * **Intervertebral ligaments:** Ossification of the outer fibers of the annulus fibrosus (forming **syndesmophytes**) leads to the "Bamboo Spine" appearance, but this is a late-stage feature. * **Intervertebral discs:** AS primarily affects the entheses and synovial joints; the discs are involved secondarily through calcification or the Andersson lesion (inflammatory spondylodiscitis), not as a primary early event. **Clinical Pearls for NEET-PG:** * **Earliest Sign on MRI:** Bone marrow edema (STIR sequence) around the SI joints (detectable before X-ray changes). * **Earliest Sign on X-ray:** Blurring of the joint margins (Grade 1 sacroiliitis). * **HLA-B27:** Strongly associated (>90% of cases). * **Dagger Sign:** A single central radiodense line on X-ray due to ossification of supraspinous and interspinous ligaments. * **Trolley Track Sign:** Three vertical linear densities due to ossification of the central ligaments and lateral facet joint capsules.

Q: Which of the following is not a type I geographic lesion of bone?

Ewing's sarcoma. The classification of bone destruction patterns (Lodwick classification) is a high-yield concept for NEET-PG. Bone lesions are categorized based on their margins, which indicate the rate of growth and the bone's biological response. **Explanation of the Correct Answer:** **D. Ewing’s Sarcoma** is the correct answer because it typically presents as a **Type III (Permeative)** or **Type II (Moth-eaten)** lesion. These patterns signify a highly aggressive, rapidly growing malignancy where the tumor infiltrates the bone so quickly that the host bone does not have time to form a distinct reactive margin. Radiologically, it lacks a clear border and often shows a "sunburst" or "onion-skin" periosteal reaction. **Explanation of Incorrect Options:** **Type I (Geographic)** lesions are slow-growing, well-defined radiolucencies. * **A. Fibrous Dysplasia:** Typically a Type IA or IB lesion. It is a benign fibro-osseous lesion with a well-defined "ground-glass" appearance. * **B. Brodie’s Abscess:** A subacute osteomyelitis that presents as a Type IA lesion—a well-defined radiolucency with a thick, sclerotic rim (reactive bone). * **C. Giant Cell Tumor (GCT):** Usually a Type IC lesion. While it is locally aggressive and lacks a sclerotic rim, it still maintains a distinct "geographic" transition zone at the epiphysis. **NEET-PG High-Yield Pearls:** * **Type IA:** Geographic with a sclerotic rim (e.g., Non-ossifying fibroma, Brodie’s abscess). * **Type IB:** Geographic without a sclerotic rim (e.g., Unicameral bone cyst). * **Type IC:** Geographic with ill-defined margins (e.g., GCT, Osteoblastoma). * **Permeative Pattern (Type III):** Classic for Ewing’s sarcoma and Lymphoma; indicates high-grade malignancy.

Q: Shenton's line is a radiological line used to determine the pathology of:

Hip. **Explanation:** **Shenton’s Line** is a fundamental radiological landmark used in the evaluation of the **hip joint** on an Anteroposterior (AP) radiograph. It is an imaginary curved line formed by the continuous arc of the **inferior border of the superior pubic ramus** and the **medial margin of the femoral neck**. In a normal, healthy hip, this line is smooth and unbroken. A disruption or "step-off" in Shenton’s line indicates pathology, most commonly **Developmental Dysplasia of the Hip (DDH)**, femoral neck fractures, or slipped capital femoral epiphysis (SCFE). **Why other options are incorrect:** * **Ankle:** Key radiological lines include the *Tibiofibular clear space* and *Talar tilt*, used to assess syndesmotic injuries or fractures. * **Elbow:** The primary lines are the *Anterior Humeral Line* and the *Radiocapitellar Line*, crucial for diagnosing supracondylar fractures and radial head dislocations in pediatrics. * **Shoulder:** Evaluation focuses on the *Glenohumeral joint space* and the *Scapular 'Y' view* to detect dislocations. **High-Yield Clinical Pearls for NEET-PG:** * **DDH Triad:** Disruption of Shenton’s line is often seen alongside a shallow acetabulum and a lateralized femoral head. * **Hilgenreiner’s and Perkins’ Lines:** These are also used in hip radiography to calculate the acetabular index and determine femoral head position. * **Ward’s Triangle:** A radiolucent area in the neck of the femur (area of least resistance) important in osteoporosis assessment. * **Klein’s Line:** Specifically used to diagnose Slipped Capital Femoral Epiphysis (SCFE).

Q: What is the finding seen on X-ray of the right shoulder?

Fracture of the clavicle. ***Fracture of the clavicle*** - **Clavicle fractures** are the most common shoulder injuries, typically showing a clear **discontinuity** of the cortical bone with possible **displacement** or **angulation**. - On X-ray, look for **cortical disruption**, **bone fragment overlap**, or **step-off deformity** along the clavicular shaft, most commonly in the **middle third**. *Fracture of the scapula* - Scapular fractures are **uncommon** and require significant **high-energy trauma**, typically from motor vehicle accidents or falls from height. - X-ray would show **cortical breaks** in the scapular body, neck, or glenoid, often requiring **CT scan** for detailed evaluation due to overlapping structures. *Fracture-dislocation of the acromioclavicular joint* - AC joint injuries present with **widening** of the **acromioclavicular space** and possible **superior displacement** of the clavicle relative to the acromion. - Associated with **coracoclavicular ligament disruption**, showing increased **coracoclavicular distance** on X-ray, not a discrete bone fracture. *Fracture of the 1st rib* - First rib fractures are **extremely rare** and typically associated with **severe thoracic trauma** or **neurogenic thoracic outlet syndrome**. - Would appear as a **cortical break** in the **curved first rib** near the thoracic apex, often requiring **dedicated rib views** or **CT** for visualization.

Question 1

Which of the following conditions is characterized by the finding shown?

Accepted Answer

All of the above

Answer

Tuberculosis

Answer

Multiple myeloma

Answer

Osteogenesis imperfecta

Question 2

A 48-year-old man with a long history of low back pain presents with similar symptoms. His previous X-ray 6 years ago showed degenerative disc changes. What should be done next?

Accepted Answer

X-ray should not be repeated

Answer

Repeat X-ray

Answer

If any systemic disease is suspected, MRI should be done

Answer

If neurological deficit is suspected, CT should be done

Question 3

Which of the following best represents the bone loss in the following radiograph?

Accepted Answer

X - 1.5 mm

Answer

X - 0.5 mm

Answer

X + 0.5 mm

Answer

X

Question 4

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

Accepted Answer

Diffuse periosteal reaction

Answer

Esophageal dysmotility

Answer

Erosion of the tip of the phalanges

Answer

Lung nodules

Question 5

Which of the following conditions is NOT associated with the 'bone within a bone' appearance?

Accepted Answer

Hyperthyroidism

Answer

Osteopetrosis

Answer

Acromegaly

Answer

Hypercalcemia

Question 6

In ankylosing spondylitis, what are the first radiological changes seen?

Accepted Answer

Sacro-iliac joints

Answer

Intervertebral ligament

Answer

Vertebral bodies

Answer

Intervertebral discs

Question 7

Which of the following is not a type I geographic lesion of bone?

Accepted Answer

Ewing's sarcoma

Answer

Fibrous dysplasia

Answer

Brodie's abscess

Answer

Giant cell tumor

Question 8

What is the earliest radiological sign indicative of sacroiliitis on X-ray?

Accepted Answer

Blurring of the sacroiliac joint

Answer

Osteophytes

Answer

Erosion

Answer

Sclerosis

Question 9

Shenton's line is a radiological line used to determine the pathology of:

Accepted Answer

Hip

Answer

Ankle

Answer

Elbow

Answer

Shoulder

Question 10

What is the finding seen on X-ray of the right shoulder?

Accepted Answer

Fracture of the clavicle

Answer

Fracture of the scapula

Answer

Fracture-dislocation of the acromioclavicular joint

Answer

Fracture of the 1st rib

Musculoskeletal Radiology — MCQs

Musculoskeletal Radiology — MCQs

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