Musculoskeletal Radiology Practice Questions

Q: What is the main diagnostic feature of osteoarthritis on X-ray imaging?

Joint space narrowing. ***Joint space narrowing*** - This is the **primary and most consistent radiographic feature** of **osteoarthritis (OA)**, reflecting progressive **cartilage loss** over time. - It is the earliest radiographic change and forms the basis of radiological grading systems for OA severity. - Joint space narrowing is caused by **articular cartilage degradation**, allowing the bone ends to move closer together. - Along with **osteophytes**, it constitutes the cardinal radiographic sign of OA. *Subchondral sclerosis* - While a characteristic feature of OA, **subchondral sclerosis** represents a secondary change occurring as bone remodeling in response to cartilage loss. - It reflects hardening and thickening of bone beneath the articular surface but typically appears later in disease progression. - It is a hallmark feature but not the primary diagnostic criterion. *Periarticular osteopenia* - This refers to decreased bone density around the joint and is characteristic of **inflammatory arthropathies** like **rheumatoid arthritis**, not osteoarthritis. - OA typically shows **increased bone density** (sclerosis) rather than osteopenia. - It suggests active inflammation and bone resorption, which is distinct from the degenerative changes in OA. *Joint ankylosis* - **Joint ankylosis** is complete bony fusion of a joint, seen in severe inflammatory conditions like **ankylosing spondylitis** or advanced rheumatoid arthritis. - It is not a feature of osteoarthritis, which maintains joint mobility despite cartilage loss and remodeling. - OA is characterized by **degeneration**, not fusion.

Q: Which investigation is least effective in diagnosing acute osteomyelitis?

X-ray. ***X-ray*** - **Plain radiographs** are often normal in the early stages of acute osteomyelitis, as bony changes take time to develop. - Changes like **periosteal elevation** or **bony destruction** typically become visible only after 10-14 days following infection onset. *Bone scan* - A **three-phase bone scan** (technetium-99m) is highly sensitive for detecting early osteomyelitis by showing increased blood flow and uptake in the affected area. - It can detect changes within 24-48 hours of infection, making it useful when plain radiographs are normal. *MRI* - **Magnetic Resonance Imaging (MRI)** is considered the most sensitive and specific imaging modality for diagnosing acute osteomyelitis. - It provides excellent soft tissue contrast, allowing early detection of **marrow edema**, **abscess formation**, and **cortical disruption**. *CT scan* - **Computed Tomography (CT) scans** are useful for visualizing cortical bone changes, **sequestra**, and defining the extent of bone involvement, especially helpful for surgical planning. - While more sensitive than X-rays, it is typically less sensitive than MRI in detecting early marrow changes in acute osteomyelitis.

Q: Shenton's line is seen in X-ray of -

Antero-posterior pelvis with both hips. ***Antero-posterior pelvis with both hips*** - Shenton's line is a curved line that can be drawn along the inferior border of the **femoral neck** and continuous with the inferior border of the **superior pubic ramus** (obturator foramen). - It is best visualized on an **antero-posterior X-ray of the pelvis** including both hips and is commonly assessed for hip dislocations or fractures. *Antero-posterior shoulder* - This view is primarily used to assess the **glenohumeral joint**, clavicle, and scapula. - Shenton's line specifically relates to the hip joint anatomy and is not relevant to the shoulder. *Lateral cervical spine* - A lateral cervical spine view focuses on the alignment of the **vertebral bodies**, intervertebral discs, and neural foramina in the neck. - It is used for assessing conditions like cervical fractures, dislocations, or degenerative changes, not hip pathology. *Lateral lumbosacral spine* - This view is used to evaluate the **lumbar vertebrae** and sacrum, looking for disc herniations, spondylolisthesis, or spinal alignment issues. - Shenton's line is not a landmark assessed on a lateral lumbosacral spine X-ray.

Q: Cotton wool skull is a radiological feature of which condition?

Paget's disease. ***Paget's disease*** - The "cotton wool skull" appearance is a **classic radiological finding** in **Paget's disease of bone**, particularly in the **sclerotic phase** - This appearance results from patchy areas of **osteosclerosis** (increased bone density) interspersed with areas of **osteolysis** (bone destruction) - The mixed lytic-sclerotic pattern creates the characteristic fluffy, cotton wool-like appearance on skull radiographs *Eosinophilic granuloma* - Presents as **well-demarcated lytic (punched-out) lesions** in the skull - Does not cause the mixed osteolytic and osteosclerotic changes characteristic of cotton wool appearance - Typically affects children and young adults *Fibrous dysplasia* - Appears as **ground-glass opacity** or lytic lesion with sclerotic rim on radiographs - Shows homogeneous expansion of bone rather than patchy changes - Does not produce the cotton wool pattern seen in Paget's disease *Osteopetrosis* - Characterized by abnormally **dense, uniformly sclerotic bones** throughout the skeleton - Results from defective osteoclast function (Albers-Schönberg disease) - Presents with diffuse increased density rather than the patchy cotton wool pattern

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

Hyperparathyroidism. ***Hyperparathyroidism*** - Tufting of the distal phalanx is a classic radiological feature associated with **hyperparathyroidism**, due to increased bone resorption. - This condition leads to **subperiosteal bone resorption**, especially noticeable in the phalangeal tufts of the fingers [2]. *Gout* - Gout is characterized by the **deposition of uric acid crystals**, typically affecting the **metatarsophalangeal** joint [1]. - It does not exhibit the specific bony changes such as tufting seen in hyperparathyroidism. *Hypoparathyroidism* - Hypoparathyroidism leads to **hypocalcemia** and symptoms such as tetany, but does not cause tufting of the distal phalanx. - This condition is marked by **bone density increases**, contrary to the resorption seen in hyperparathyroidism. *Hyperkalemia* - Hyperkalemia refers to abnormally high **potassium levels** and is primarily associated with renal issues and cardiac symptoms. - It has no direct connection to bony changes or tufting of the phalanges.

Q: Which of the following is not a typical radiological finding in rheumatoid arthritis?

Subchondral sclerosis. ***Subchondral sclerosis*** - **Subchondral sclerosis** is a hallmark of **osteoarthritis**, representing bone hardening beneath damaged cartilage, which is not characteristic of rheumatoid arthritis. - In rheumatoid arthritis, the primary pathology involves **synovial inflammation** leading to bone erosion rather than bone thickening. *Symmetrical involvement* - **Symmetrical polyarthritis** is a defining feature of rheumatoid arthritis, often affecting the same joints on both sides of the body. - This pattern helps differentiate it from other inflammatory arthropathies that might exhibit asymmetrical joint involvement. *Marginal erosion* - **Marginal erosions** are a classic early radiological sign of rheumatoid arthritis, caused by the inflammatory pannus invading the bare areas of bone. - These erosions typically appear at the edges of the joint, where the synovial membrane attaches. *Juxta-articular osteopenia* - **Juxta-articular osteopenia** (localized bone thinning near the joint) is an early and common radiological finding in rheumatoid arthritis. - It results from local inflammatory mediators and disuse around the affected joints.

Q: Based on the X-ray image, which condition is indicated by a sunray appearance?

Osteosarcoma. ***Osteosarcoma*** - A **sunray or sunburst appearance** on X-ray is a classic radiologic sign of osteosarcoma, representing new bone formation perpendicular to the bone cortex. - This aggressive primary bone tumor often presents with a combination of **osteoblastic (bone-forming)** and osteolytic (bone-destroying) features. *Osteochondroma* - Osteochondromas appear as **bony outgrowths** from the surface of bones, covered by a cartilage cap. - They are typically benign and do not exhibit the aggressive periosteal reaction seen in a sunray appearance. *Osteoclastoma* - Also known as a **giant cell tumor of bone**, osteoclastomas are typically **lytic lesions** that cause bone destruction. - They do not form new bone in a sunray pattern. *Chondroblastoma* - Chondroblastomas are rare, benign cartilaginous tumors usually found in the **epiphysis** of long bones. - They are typically **well-circumscribed lytic lesions** with fine, punctate calcifications, not a sunray pattern.

Q: Identify the condition based on the provided image of a bone lesion. Ensure the diagnosis is based on the radiological and clinical features provided.

Brodie abscess. ***Brodie abscess*** - This lesion typically presents as a **well-defined, lucent lesion** with a surrounding rim of **sclerotic bone**, often located in the metaphysis of long bones. - It represents a subacute or chronic form of osteomyelitis, which can be **painful** and may mimic a bone tumor. *Osteoid osteoma* - While also a lucent lesion with surrounding sclerosis, an osteoid osteoma is characterized by a small, central **nidus** that is typically less than 1.5 cm and causes **nocturnal pain relieved by NSAIDs**. - The lesion in the image appears larger and lacks the characteristic small nidus typically associated with osteoid osteoma. *Intracortical hemangioma* - An intracortical hemangioma is a rare benign vascular tumor of bone that typically presents as an **expansile, lytic lesion** with internal trabeculations, sometimes described as a "sunburst" or "spoke-wheel" pattern. - It does not typically exhibit the prominent sclerotic rim seen in the image. *Chondromyxoid fibroma* - This is a rare benign cartilaginous tumor often presenting as an **eccentric, lobulated lytic lesion** with a sclerotic margin, usually in the metaphysis of long bones. - While it can have a sclerotic margin, it typically lacks the dense, uniform sclerosis and central lucency characteristic of a Brodie abscess.

Q: What condition is best diagnosed using a Skyline view X-ray?

Patellofemoral problem. ***Patellofemoral problem*** - The **Skyline view**, also known as the **Merchant view** or tangential patella view, is specifically designed to visualize the **patellofemoral joint**. - It is crucial for assessing conditions like **patellar subluxation**, tracking disorders, and **chondromalacia patellae** by showing the articulation between the patella and the femoral trochlea. *Radioulnar problem* - Problems with the **radioulnar joint** are typically evaluated with standard **AP and lateral views of the forearm and elbow**. - The Skyline view offers no diagnostic value for the radioulnar joint as it focuses on the knee. *Tibiofibular problem* - Issues concerning the **tibiofibular joints** (proximal or distal) are best assessed using **AP and lateral views of the lower leg or ankle**, depending on the specific joint. - The Skyline view is not used to evaluate these structures. *Skull fracture* - **Skull fractures** are diagnosed using standard **skull X-rays** (e.g., AP, lateral, Towne, Caldwell views) or more commonly, a **CT scan of the head**. - The Skyline view is specific to the knee and entirely inappropriate for evaluating the skull.

Q: Which of the following statements about lipoma is radiologically true?

Low attenuation on CT scan. ***Low attenuation on CT scan*** - Lipomas, being composed of **fat**, appear as areas of **low attenuation** (typically -50 to -150 Hounsfield Units) on computed tomography (CT) scans. - This low attenuation is a **key diagnostic characteristic** that helps differentiate lipomas from other soft tissue masses. *Hyperechoic on ultrasound* - Lipomas typically appear **isoechoic to hypoechoic** on ultrasound, not consistently hyperechoic. - They may have a thin echogenic capsule, but the internal contents are usually similar to or less echogenic than adjacent subcutaneous fat. *Hyperintense on fat-suppressed sequences* - This is **incorrect** - lipomas show **signal dropout** (become dark/hypointense) on fat-suppressed sequences (STIR, fat-sat T1/T2). - Signal suppression on fat-saturated sequences is actually a **diagnostic feature** confirming the fatty nature of the lesion. - Note: Lipomas ARE hyperintense on standard T1-weighted imaging due to fat content. *Hyper-intense on T2-weighted MRI* - Lipomas typically show **intermediate to slightly hyperintense signal** on T2-weighted MRI, but not markedly hyperintense like fluid. - They are less bright than fluid-filled structures or highly vascular lesions on T2-weighted sequences.

Question 1

What is the main diagnostic feature of osteoarthritis on X-ray imaging?

Accepted Answer

Joint space narrowing

Answer

Subchondral sclerosis

Answer

Periarticular osteopenia

Answer

Joint ankylosis

Question 2

Which investigation is least effective in diagnosing acute osteomyelitis?

Accepted Answer

X-ray

Answer

Bone scan

Answer

MRI

Answer

CT scan

Question 3

Shenton's line is seen in X-ray of -

Accepted Answer

Antero-posterior pelvis with both hips

Answer

Antero-posterior shoulder

Answer

Lateral cervical spine

Answer

Lateral lumbosacral spine

Question 4

Cotton wool skull is a radiological feature of which condition?

Accepted Answer

Paget's disease

Answer

Osteopetrosis

Answer

Eosinophilic granuloma

Answer

Fibrous dysplasia

Question 5

Tufting of the distal phalanx is characteristically seen in which of the following conditions?

Accepted Answer

Hyperparathyroidism

Answer

Hyperkalemia

Answer

Hypoparathyroidism

Answer

Gout

Question 6

Which of the following is not a typical radiological finding in rheumatoid arthritis?

Accepted Answer

Subchondral sclerosis

Answer

Marginal erosion

Answer

Symmetrical involvement

Answer

Juxta-articular osteopenia

Question 7

Based on the X-ray image, which condition is indicated by a sunray appearance?

Accepted Answer

Osteosarcoma

Answer

Osteochondroma

Answer

Osteoclastoma

Answer

Chondroblastoma

Question 8

Identify the condition based on the provided image of a bone lesion. Ensure the diagnosis is based on the radiological and clinical features provided.

Accepted Answer

Brodie abscess

Answer

Intracortical hemangioma

Answer

Chondromyxoid fibroma

Answer

Osteoid osteoma

Question 9

What condition is best diagnosed using a Skyline view X-ray?

Accepted Answer

Patellofemoral problem

Answer

Tibiofibular problem

Answer

Skull fracture

Answer

Radioulnar problem

Question 10

Which of the following statements about lipoma is radiologically true?

Accepted Answer

Low attenuation on CT scan

Answer

Hyperechoic on ultrasound

Answer

Hyperintense on fat-suppressed sequences

Answer

Hyper-intense on T2-weighted MRI

Musculoskeletal Radiology — MCQs

Musculoskeletal Radiology — MCQs

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