Musculoskeletal Radiology — MCQs

Musculoskeletal Radiology Indian Medical PG Practice Questions and MCQs

Question 271: The following Skull X-ray is seen in:

A. Thalassemia (Correct Answer)
B. Multiple myeloma
C. Histiocytosis-X
D. Paget's disease

Explanation: ***Thalassemia*** - The image shows a classic **hair-on-end appearance** of the skull, which is a characteristic radiological finding in severe forms of thalassemia. - This appearance results from **marrow hyperplasia** in response to chronic hemolysis, leading to widening of the diploic space and expansion of bone marrow at the expense of outer cortical bone. *Multiple myeloma* - Multiple myeloma typically presents with multiple well-demarcated, **punched-out lytic lesions** in the skull, without a "hair-on-end" pattern. - The bone lesions are due to plasma cell infiltration and osteoclast activation, leading to discrete areas of bone destruction. *Histiocytosis-X* - Histiocytosis-X, also known as Langerhans cell histiocytosis, can cause **lytic bone lesions** in the skull, often referred to as "geographic" or "punched-out" lesions. - While it can cause diffuse bone involvement, it does not typically produce the organized trabecular pattern characteristic of "hair-on-end." *Paget's disease* - Paget's disease of bone often manifests as areas of **bone enlargement**, cortical thickening, and a mixture of lytic and sclerotic changes, sometimes described as a **cotton-wool appearance** in the skull. - It does not present with the "hair-on-end" pattern, which is primarily associated with conditions causing chronic marrow expansion.

Question 272: Comment on the diagnosis based on X-ray spine findings:

A. Osteopetrosis
B. Mucopolysaccharidosis (Correct Answer)
C. Spondylolisthesis
D. Sickle cell anaemia

Explanation: **_Mucopolysaccharidosis_** - The imaging features, particularly the **beaked vertebrae** and **widespread bone changes** (dysostosis multiplex), are characteristic of mucopolysaccharidosis. - The vertebral bodies show **anterior inferior beaking**, especially in the lumbar spine, which is a hallmark finding. - This is a storage disorder affecting glycosaminoglycan metabolism, leading to skeletal dysplasia. *Osteopetrosis* - Osteopetrosis is characterized by **increased bone density** ("marble bones") due to defective osteoclast function. - The X-ray does not show diffusely increased bone density; instead, it demonstrates abnormal vertebral shape with anterior beaking. *Spondylolisthesis* - Spondylolisthesis involves the **forward displacement of one vertebra over another**, typically due to a defect in the pars interarticularis or degenerative changes. - This condition presents with vertebral slippage, which is not evident in the provided X-rays. *Sickle cell anaemia* - Sickle cell anaemia can cause bony changes such as **H-shaped vertebrae** due to bone infarcts and avascular necrosis. - The appearance of the vertebrae with anterior beaking is not typical for sickle cell disease.

Question 273: A 28-year-old female with chronic kidney disease presents with bone pain and elevated parathyroid hormone levels. She has a history of renal stones. What is the sign visible in the image?

A. Trummerfeld zones
B. Rugger-jersey spine (Correct Answer)
C. Vertebra plana
D. Looser zones

Explanation: ***Rugger-jersey spine*** - The image exhibits alternating bands of dense and lucent bone in the vertebral bodies, which is characteristic of the **rugger-jersey spine** sign. - This sign is classically seen in **renal osteodystrophy due to secondary hyperparathyroidism**, which occurs in chronic kidney disease. - In secondary hyperparathyroidism, the dense bands represent increased osteosclerosis at the vertebral endplates, while the central lucent areas reflect increased bone resorption. *Trummerfeld zones* - These are zones of **reduced mineralization** in the metaphyses of long bones, typically seen in **rickets** or **scurvy**. - They are not associated with the vertebral changes seen in the image or the clinical scenario of chronic kidney disease with secondary hyperparathyroidism. *Vertebra plana* - Refers to a vertebra that has **collapsed** to a flat, disc-like shape, often maintaining its cortical margins. - It is typically caused by conditions like **eosinophilic granuloma**, metastatic disease, or severe osteoporosis, none of which fit the radiographic appearance of rugger-jersey spine. *Looser zones* - These are also known as **pseudofractures** and are radiolucent lines that represent uncalcified osteoid, characteristic of **osteomalacia**. - They are typically seen in specific locations like the femoral neck, pubic rami, and scapula, not in the vertebral bodies as shown in the image.

Question 274: The following X-ray pelvis of a child shows:

A. TB Hip joint
B. Battered baby syndrome
C. Slipped capital femoral epiphysis
D. Congenital hip dislocation (Correct Answer)

Explanation: ***Congenital hip dislocation*** - The X-ray shows the **femoral head** on the right side is located **outside the acetabulum**, indicating congenital hip dislocation. - This condition is also known as **developmental dysplasia of the hip (DDH)** and is characterized by abnormal development of the hip joint. *TB Hip joint* - **Tuberculosis of the hip joint** typically presents with pain, limping, and joint effusion, and can show **joint space narrowing**, **osteolysis**, and **bone destruction** on imaging. - The image clearly shows a dislocated femoral head, not primarily destructive arthritic changes typical of TB. *Battered baby syndrome* - **Battered baby syndrome**, or child abuse, would show signs of **multiple fractures** at various stages of healing, or **metaphyseal corner fractures**. - The image does not display any signs of fractures or other forms of trauma, but rather a developmental abnormality. *Slipped capital femoral epiphysis* - **Slipped capital femoral epiphysis (SCFE)** involves the slippage of the **femoral head** relative to the **femoral neck** through the growth plate. - This condition typically occurs in **adolescents** and shows widening or irregularity of the growth plate and posterior/inferior displacement of the epiphysis, not a complete dislocation of the femoral head from the acetabulum as seen here.

Question 275: The X-ray and MRI findings given below point to the diagnosis of: (Recent NEET Pattern 2016-17)

A. Osteoid osteoma
B. Osteoclastoma
C. Osteosarcoma
D. Pigmented villonodular synovitis (Correct Answer)

Explanation: ***Pigmented villonodular synovitis*** - The MRI image shows characteristic **low signal intensity foci** on T1 and T2 weighted images due to hemosiderin deposition, along with a nodular synovial mass, which are hallmarks of **pigmented villonodular synovitis (PVNS)**. - The presence of multiple nodular lesions within the joint capsule (indicated by arrows on MRI) and the soft tissue swelling visible on X-ray, without significant bone destruction typically seen in aggressive tumors, is consistent with PVNS. *Osteoid osteoma* - An osteoid osteoma typically appears as a **small lucent nidus** (<1.5 cm) with a sclerotic rim in the bone, often associated with a painful presentation relieved by NSAIDs. - The imaging findings here, particularly the large soft tissue mass and hemosiderin deposits on MRI, are not characteristic of an osteoid osteoma. *Osteoclastoma* - Osteoclastomas, also known as **giant cell tumors of bone**, are aggressive but benign tumors that appear as expansile **lytic lesions** originating in the epiphysis/metaphysis of long bones. - While they can be destructive, they typically don't present with the diffuse, hemosiderin-laden synovial proliferation seen in these images. *Osteosarcoma* - Osteosarcoma is a highly malignant bone tumor characterized by the production of **osteoid matrix** and often presents with features like cortical destruction, a soft tissue mass, and a sunburst or Codman's triangle appearance on X-ray. - The imaging features shown, particularly the T1/T2 hypointense foci on MRI due to hemosiderin, are not typical for osteosarcoma, which would instead show more features of bone destruction and aggressive periosteal reaction.

Question 276: The following X-ray of the pelvis shows:

A. Simple bone cyst
B. Aneurysmal bone cyst
C. Posterior hip dislocation
D. Gas shadow artifact (Correct Answer)

Explanation: ***Gas shadow artifact*** - The image shows a **dark, lucent area (gas shadow)** overlying the pelvic structures, particularly noticeable over the soft tissues and potentially obscuring parts of the bone. This indicates extraneous gas, likely from the bowel, that is projected onto the image. - Artefacts like gas shadows are common in X-rays and can sometimes mimic or obscure pathology, but their characteristic appearance helps differentiate them from true bone lesions or dislocations. This is an artifact. *Simple bone cyst* - A simple bone cyst (also known as a **unicameral bone cyst**) typically appears as a well-defined, lytic lesion with a sclerotic rim within the bone, often associated with a "fallen fragment sign" if a fracture has occurred. - The appearance in the image is not consistent with a true bone lesion within the bone itself but rather an overlying shadow. *Aneurysmal bone cyst* - An aneurysmal bone cyst is an expansile, lytic lesion that often presents with a **"soap bubble" appearance** and may contain fluid-fluid levels on MRI. - This lesion is typically intraosseous and causes bone expansion, which is not depicted by the observed gas shadow. *Posterior hip dislocation* - A posterior hip dislocation involves the **femoral head being displaced posteriorly and superiorly** relative to the acetabulum, leading to characteristic changes in the hip joint alignment. - The image does not show a change in the anatomical relationship between the femoral head and acetabulum; instead, it shows an external lucency.

Question 277: The given X-ray of the humerus shows:

A. Aneurysmal bone cyst
B. Ewing sarcoma
C. Posterior dislocation of shoulder
D. Fibrous dysplasia (Correct Answer)

Explanation: ***Fibrous dysplasia*** - The image shows a humeral lesion with a **ground-glass matrix** and areas of **cortical thinning** and expansion, consistent with fibrous dysplasia. - Fibrous dysplasia is a developmental anomaly where normal bone is replaced by **fibrous tissue** and immature woven bone, often appearing as a **shepherd's crook deformity** in long bones. *Aneurysmal bone cyst* - Aneurysmal bone cysts typically present as expansile **lytic lesions** with multiple **fluid-fluid levels** on imaging, which cannot be clearly discerned on this X-ray. - While they can be expansile like the lesion shown, they characteristically have a **"soap bubble" appearance** due to internal septations. *Ewing sarcoma* - Ewing sarcoma often presents with a destructive, infiltrative lesion and a characteristic **"onion-skin" periosteal reaction**, none of which are definitively seen here. - This highly malignant tumor typically causes **moth-eaten or permeative bone destruction**, which is distinct from the more uniform ground-glass appearance. *Posterior dislocation of shoulder* - A posterior dislocation of the shoulder would show the **humeral head displaced posteriorly** relative to the glenoid, often characterized by a "light bulb" sign or loss of true glenohumeral articulation. - The image exhibits an **intramedullary lesion** within the humeral shaft, not a displacement of the joint.

Question 278: A patient presents with neck pain and rigidity which gets relieved after bathing in hot water and exercise. Cervical X-ray is shown below. What is your diagnosis?

A. Spondylolisthesis
B. Spondylosis
C. Spondylitis (Correct Answer)
D. Spondyloptosis

Explanation: ***Spondylitis (Ankylosing Spondylitis)*** - The image shows **fusion of vertebral bodies** (ankylosis) and an appearance consistent with a **bamboo spine**, which is characteristic of advanced **Ankylosing Spondylitis**. - The clinical presentation is pathognomonic: **inflammatory back pain with morning stiffness** that is **relieved by activity and hot water bathing** (as opposed to mechanical pain which worsens with activity). - This is a classic presentation of inflammatory spondyloarthropathy, specifically ankylosing spondylitis. *Spondylolisthesis* - This condition involves the **slippage of one vertebra over another**, which is not the primary finding on this X-ray. - While spondylolisthesis can cause neck pain, it does **not typically present with diffuse vertebral fusion** as seen here, and the pain would worsen with activity (mechanical pattern), not improve. *Spondylosis* - Spondylosis refers to **degenerative changes** of the spine, often involving **osteophytes** and **disc space narrowing**. - While some degenerative changes may be present, the pronounced fusion and **"bamboo spine" appearance** go beyond typical spondylosis and indicate an inflammatory process. - Degenerative pain typically **worsens with activity**, unlike the relief with exercise seen in this patient. *Spondyloptosis* - Spondyloptosis is an **extreme form of spondylolisthesis** where one vertebra has completely slipped off the one below it (Grade V slip). - This severe displacement is not apparent on the X-ray; instead, there is **fusion rather than translational instability**.

Question 279: A 65-year-old man presents with bone pains. X-ray Skull shows? (Recent NEET Pattem 2018-19)

A. Paget's disease
B. Fibrous dysplasia
C. Histiocytosis-X
D. Multiple myeloma (Correct Answer)

Explanation: ***Multiple myeloma*** - The X-ray shows multiple, well-defined, lytic lesions (''**punched-out lesions**'') scattered throughout the skull, which is highly characteristic of multiple myeloma. - This condition is a **plasma cell malignancy** that commonly affects older adults and often presents with **bone pain** due to osteolytic activity. *Paget's disease* - Characterized by abnormal bone remodeling, leading to bone enlargement, thickening, and a **"cotton wool" appearance** on X-ray, which is not seen here. - While it can cause bone pain and skull involvement, the lytic pattern in the X-ray is not typical for Paget's disease. *Fibrous dysplasia* - This condition involves **normal bone marrow** being replaced by **fibrous tissue** and immature bone, often presenting as a **ground-glass appearance** or expansile lesions, usually in younger individuals. - The distinct "punched-out" lesions seen in the image are not characteristic of fibrous dysplasia. *Histiocytosis-X* - Also known as Langerhans cell histiocytosis, it can cause **lytic bone lesions**, particularly in the skull, described as a **"map-like" or "geographic" pattern**. - Although it causes lytic lesions, the pattern in the image, with its numerous small, widespread lytic lesions, is more indicative of multiple myeloma in an older adult.

Question 280: A middle-aged man presents with a lower jaw swelling. Clinically, there is expansion of the left ramus and the X-ray mandible shows soap bubble appearance. What is the clinical diagnosis?

A. Aneurysmal bone cyst
B. Odontogenic myxoma
C. Ameloblastoma (Correct Answer)
D. Keratocyst

Explanation: ***Ameloblastoma*** - Ameloblastoma is the most common odontogenic tumor, often presenting as a **slow-growing, expansile swelling** in the posterior mandible, as seen in this patient. - The classic **"soap bubble" or "honeycomb" radiographic appearance** is highly characteristic of ameloblastoma, reflecting its multilocular nature. *Aneurysmal bone cyst* - While an aneurysmal bone cyst can cause bony expansion, it typically presents with a **blood-filled lesion** and may not consistently show a "soap bubble" appearance unless it's very large and destructive. - Radiographically, it often appears as a **lytic lesion** rather than strictly multilocular. *Odontogenic myxoma* - Odontogenic myxoma can also cause jaw swelling and has a multilocular appearance, but it's often described as having a **"tennis racket" or "stepped ladder" trabeculation** pattern rather than clear "soap bubbles." - Its incidence is lower than ameloblastoma, making it less likely given the classic presentation. *Keratocyst* - An odontogenic keratocyst (OKC), now often referred to as a **keratocystic odontogenic tumor (KCOT)**, is primarily a cyst that can grow extensively and cause expansion. - Radiographically, it typically appears as a **well-defined, unilocular or multilocular radiolucency** but rarely has the classic "soap bubble" appearance as consistently as ameloblastoma.

Practice by Chapter

Radiographic Anatomy of Bones and Joints

Practice Questions

Imaging of Fractures and Dislocations

Practice Questions

Arthritides: Inflammatory and Degenerative

Practice Questions

Metabolic Bone Diseases

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Bone and Soft Tissue Tumors

Practice Questions

Congenital Skeletal Anomalies

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Spine Imaging

Practice Questions

Skeletal Infections

Practice Questions

Sports Medicine Imaging

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Imaging of Prostheses and Implants

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Musculoskeletal Ultrasound

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MSK Interventional Procedures

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