Musculoskeletal Radiology Practice Questions

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

Bone erosions. ***Bone erosions*** - **Bone erosions** are a hallmark feature of **rheumatoid arthritis (RA)**, representing irreversible joint damage caused by synovial inflammation and pannus formation. - They typically appear early in the disease course and contribute to functional impairment. *Juxta-articular osteosclerosis* - **Osteosclerosis** (increased bone density) near the joints is more characteristic of **osteoarthritis**, where new bone formation occurs in response to cartilage loss. - In rheumatoid arthritis, **juxta-articular osteopenia** (decreased bone density) due to inflammation and disuse is more common. *Bamboo spine* - **Bamboo spine** is a characteristic radiographic finding in **ankylosing spondylitis**, due to syndesmophyte formation and fusion of vertebral bodies. - It is not associated with rheumatoid arthritis. *Peri-articular calcification* - **Peri-articular calcification** is seen in conditions like **calcium pyrophosphate deposition disease (CPPD)**, also known as pseudogout. - While calcification can occur in some rheumatic conditions, it is not a primary or characteristic feature of rheumatoid arthritis.

Q: What is the gold standard for the diagnosis of osteoporosis?

Dual energy X-ray absorptiometry. ***Dual energy X-ray absorptiometry*** - **DXA** is the current **gold standard** for diagnosing osteoporosis and assessing fracture risk due to its high precision and accuracy in measuring **bone mineral density (BMD)**. - It measures BMD at clinically relevant sites such as the **lumbar spine** and **hip**, providing T-scores and Z-scores for comparison. *Single energy X-ray absorptiometry* - **SXA** measures BMD at peripheral sites but is **less accurate** and comprehensive than DXA for diagnosing osteoporosis. - It has **limited utility** as a diagnostic tool for osteoporosis at the hip or spine, which are critical sites for fracture risk. *Ultrasound* - **Quantitative ultrasound (QUS)** can assess bone quality but is primarily used for **screening** and is not accurate enough for definitive diagnosis or treatment monitoring of osteoporosis. - It does **not provide direct bone mineral density measurements** comparable to DXA for diagnostic purposes. *Quantitative computed tomography* - **QCT** can measure volumetric bone density and is useful for assessing **trabecular bone**, but involves higher radiation exposure than DXA. - It is **more expensive** and less readily available than DXA, making it a secondary option for osteoporosis diagnosis.

Q: Atrophic champagne glass pelvis is seen in which condition?

Achondroplasia. ***Achondroplasia*** - The **champagne glass pelvis** appearance, characterized by a flattened, widened iliac bone and a narrow sacrosciatic notch, is a classic radiographic sign of achondroplasia. - This pelvic shape is a consequence of abnormal **endochondral ossification**, which is the primary defect in achondroplasia. *Cretinism* - **Cretinism** (congenital hypothyroidism) primarily affects bone maturation and growth rather than bone shape, leading to features like delayed epiphyseal fusion and severe growth retardation. - While bone abnormalities occur, they typically don't include the specific champagne glass pelvis associated with achondroplasia. *Osteomalacia* - **Osteomalacia** is characterized by defective mineralization of newly formed bone, leading to soft, weak bones prone to bowing and fractures. - It does not cause an atrophic champagne glass pelvis; rather, it results in generalized bone pain, muscle weakness, and often pseudofractures. *Rickets* - **Rickets** is the childhood form of osteomalacia, where vitamin D deficiency leads to impaired mineralization of growing bone and cartilage. - It typically causes features like bowed legs, rachitic rosary, and widened growth plates, but not the specific pelvic deformity seen in achondroplasia.

Q: All are seen in acromegaly except for which of the following?

Anterior scalloping of vertebrae. ***Anterior scalloping of vertebrae*** - **Anterior vertebral scalloping** is not typically seen in acromegaly. It is more characteristic of conditions causing **aneurysmal dilatation of the aorta** or **neurofibromatosis**. - Acromegaly primarily affects bone and soft tissue growth due to excess **Growth Hormone (GH)**, leading to widespread changes, but not specific anterior vertebral erosions from bony overgrowth. *Posterior scalloping of vertebrae* - **Posterior vertebral scalloping** is a feature seen in acromegaly due to the enlargement of **spinal canal contents** or overgrowth of soft tissues in the spinal canal. - The excess **growth hormone** can cause hypertrophy of ligaments and other soft tissues, leading to pressure erosion on the posterior vertebral bodies. *Chondrocalcinosis* - **Chondrocalcinosis** (calcification of articular cartilage) is a common radiological finding in acromegaly, particularly in the **knees and hips**. - It results from altered cartilage metabolism and increased **calcium deposition** due to prolonged exposure to high levels of **growth hormone and IGF-1**. *Calcification of pinna* - **Calcification of the pinna** (auricular cartilage) is a recognized though less common feature of acromegaly due to deposition of **calcium salts** in the cartilaginous structures. - The exact mechanism is not fully understood but is believed to be related to the metabolic derangements and widespread connective tissue changes induced by **excess growth hormone**.

Q: Scotty dog sign is seen in:

Spondylolysis. ***Spondylolysis*** - The **Scotty dog sign** is a classic radiographic finding on an **oblique lumbar spine X-ray** indicating a defect in the pars interarticularis. - This defect, known as **spondylolysis**, causes the "neck" of the Scotty dog to appear broken or wearing a collar. *Fracture femur* - **Femur fractures** are typically identified by discontinuity of the cortical bone and soft tissue swelling, often visualized on **AP and lateral views of the thigh/hip**. - No specific "Scotty dog" appearance is associated with femur fractures, as this sign relates to the **lumbar spine**. *Sarcoidosis* - **Sarcoidosis** is a multi-system inflammatory disease primarily affecting the lungs and lymph nodes, with characteristic **non-caseating granulomas**. - Radiological findings typically include **hilar lymphadenopathy** and pulmonary infiltrates, not a bony defect like the Scotty dog sign. *Osteosarcoma* - **Osteosarcoma** is a primary malignant bone tumor often presenting with a **sunburst pattern** or **Codman triangle** on X-ray. - It primarily affects the metaphysis of long bones and does not produce the specific bony defect seen in the pars interarticularis.

Q: Which of the following can be detected radiographically?

Interproximal caries. ***Interproximal caries*** - Radiography, particularly **bitewing radiographs**, is the **gold standard** for detecting interproximal caries that cannot be visualized clinically - Interproximal caries appears as a **radiolucent (dark) area** in the enamel and/or dentin between adjacent teeth - Radiographs can detect caries **before clinical examination** reveals cavitation, allowing for early intervention - The demineralization process reduces tissue density, making it appear darker on radiographs compared to healthy tooth structure *Root caries* - Root caries CAN be detected radiographically, appearing as **saucer-shaped radiolucencies** at the cervical region - However, root caries may be **easier to detect clinically** than interproximal caries since root surfaces are more accessible to direct visualization - Radiographic detection is still valuable, especially for subgingival root caries *Deep caries* - Deep caries CAN be detected radiographically as **extensive radiolucent areas** extending deep into dentin - However, the term "deep caries" refers to the **extent** rather than location, and can often be detected clinically - Radiographs help assess the **proximity to the pulp** and extent of involvement **Key Point:** While all three types of caries can be detected radiographically, **interproximal caries** is the type most dependent on radiographic detection since these areas cannot be directly visualized clinically between tooth contacts.

Q: Sclerotic lesions in the bone are seen in all except:

Osteitis fibrosa. ***Osteitis fibrosa*** - This condition is associated with **hyperparathyroidism**, leading to excessive bone resorption and replacement by fibrous tissue, which is characterized by **osteopenia and cystic changes**, not sclerotic lesions. - Classic features include **brown tumors** and **subperiosteal bone resorption**. *Osteopetrosis* - Characterized by abnormally **dense bones** due to a defect in **osteoclast function**, resulting in impaired bone resorption. - This leads to diffusely **sclerotic bones** on imaging, increasing bone mass and fragility. *Melorheostosis* - A rare, non-hereditary mesenchymal dysplasia characterized by **flowing hyperostosis** of cortical bone, resembling "flowing candle wax." - This results in localized or regional areas of **sclerosis and bone thickening**. *Caffey's disease* - Also known as **infantile cortical hyperostosis**, it is characterized by areas of **sclerotic periosteal new bone formation** and proliferation, mainly in infants. - It typically affects the diaphysis of long bones, mandible, and ribs, presenting as **tender swelling** and cortical thickening.

Q: Striated vertebrae are seen in which of the following conditions?

Hemangioma. ***Hemangioma*** - **Striated vertebrae**, also known as **corduroy cloth sign** or **vertical striations**, are characteristic radiological findings of vertebral hemangiomas. - This appearance is due to the **thickened vertical trabeculae** within the vertebral body, resulting from the overgrowth of vascular tissue. *TB spine* - **Tuberculosis of the spine (Pott's disease)** typically presents with destructive lesions, **vertebral collapse**, and potentially paravertebral abscesses. - It does not typically cause the striated appearance seen in hemangiomas. *Chordoma* - Chordomas are rare, slow-growing malignant tumors often found in the **sacrococcygeal region** or clivus, less commonly affecting the mobile spine. - They tend to cause **lytic or sclerotic lesions** with soft tissue involvement and do not typically produce a striated vertebral body. *Metastasis* - **Vertebral metastases** can be lytic, blastic, or mixed, leading to bone destruction, sclerosis, or both. - While they can cause spinal pain and bone abnormalities, they do not classically result in the **corduroy cloth appearance** of striated vertebrae.

Q: The "raindrop skull" appearance is associated with which of the following conditions?

Multiple Myeloma. ***Multiple Myeloma*** - The **\"raindrop skull\"** appearance on X-ray is characteristic of multiple myeloma, resulting from numerous small, **punched-out lytic lesions** in the skull. - These lytic lesions are caused by the proliferation of **plasma cells** in the bone marrow, leading to localized bone destruction. *Hemophilia* - Hemophilia is a **bleeding disorder** caused by a deficiency in clotting factors and does not directly cause lytic bone lesions or a raindrop skull appearance. - While it can lead to **hemarthrosis** and other bleeding-related bone changes, these are distinct from the lytic lesions seen in myeloma. *Thalassemia* - Thalassemia is a **genetic blood disorder** characterized by abnormal hemoglobin production, leading to **anemia**. - Severe thalassemia can cause bone changes (e.g., **\"hair-on-end\" skull** due to marrow hyperplasia), but not the discrete lytic lesions of a raindrop skull. *Hodgkin's lymphoma* - Hodgkin's lymphoma is a **lymphatic system cancer** that can cause bone lesions, but these are typically **sclerotic** or mixed lytic/sclerotic, not the purely lytic, punched-out lesions characteristic of a raindrop skull. - Bone involvement in Hodgkin's is less common than in non-Hodgkin's lymphoma and usually presents differently.

Q: Flowing wax appearance on the anterior and posterior borders of the vertebrae is seen in?

DISH. ***DISH*** - The "flowing wax" or "melting candle wax" appearance on the anterior and posterior borders of the vertebrae is a classic radiographic finding in **Diffuse Idiopathic Skeletal Hyperostosis (DISH)**, also known as Forestier's disease. - This appearance is due to the **calcification and ossification of ligaments and entheses**, particularly the anterior longitudinal ligament. *Ankylosing spondylitis* - Characterized by ascending **sacroiliitis** and subsequent fusion of vertebral bodies, leading to a "bamboo spine" appearance, which is distinct from "flowing wax." - Involves **inflammatory changes** at entheses, but the pattern of ossification differs from DISH. *Psoriatic arthropathy* - Can affect the spine, but it typically causes **non-marginal syndesmophytes** and erosion, rather than the extensive ligamentous ossification seen in DISH. - Often associated with distinctive **peripheral arthritis** and **skin lesions**. *Rheumatoid arthritis* - Primarily affects the **synovial joints**, with spinal involvement mainly seen in the **cervical spine** leading to instability or subluxation. - Does not typically cause diffuse ligamentous ossification or a "flowing wax" appearance in the thoracolumbar spine.

Question 1

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

Accepted Answer

Bone erosions

Answer

Bamboo spine

Answer

Peri-articular calcification

Answer

Juxta-articular osteosclerosis

Question 2

What is the gold standard for the diagnosis of osteoporosis?

Accepted Answer

Dual energy X-ray absorptiometry

Answer

Single energy X-ray absorptiometry

Answer

Ultrasound

Answer

Quantitative computed tomography

Question 3

Atrophic champagne glass pelvis is seen in which condition?

Accepted Answer

Achondroplasia

Answer

Cretinism

Answer

Osteomalacia

Answer

Rickets

Question 4

All are seen in acromegaly except for which of the following?

Accepted Answer

Anterior scalloping of vertebrae

Answer

Posterior scalloping of vertebrae

Answer

Calcification of pinna

Answer

Chondrocalcinosis

Question 5

Scotty dog sign is seen in:

Accepted Answer

Spondylolysis

Answer

Fracture femur

Answer

Sarcoidosis

Answer

Osteosarcoma

Question 6

Which of the following can be detected radiographically?

Accepted Answer

Interproximal caries

Answer

Root caries

Answer

Deep caries

Answer

None of the options

Question 7

Sclerotic lesions in the bone are seen in all except:

Accepted Answer

Osteitis fibrosa

Answer

Melorheostosis

Answer

Caffey's disease

Answer

Osteopetrosis

Question 8

Striated vertebrae are seen in which of the following conditions?

Accepted Answer

Hemangioma

Answer

TB spine

Answer

Chordoma

Answer

Metastasis

Question 9

The "raindrop skull" appearance is associated with which of the following conditions?

Accepted Answer

Multiple Myeloma

Answer

Hemophilia

Answer

Thalassemia

Answer

Hodgkin's lymphoma

Question 10

Flowing wax appearance on the anterior and posterior borders of the vertebrae is seen in?

Accepted Answer

DISH

Answer

Ankylosing spondylitis

Answer

Psoriatic arthropathy

Answer

Rheumatoid arthritis

Musculoskeletal Radiology — MCQs

Musculoskeletal Radiology — MCQs

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