Which imaging modalities are commonly used to evaluate vertebral osteomyelitis?

• A. MRI only.
• B. Ultrasound and Doppler.
• C. MRI, X-ray, and nuclear imaging.
• D. CT angiography only.

Answer: (C)

The main idea is that vertebral osteomyelitis is best evaluated with a combination of imaging modalities, with MRI serving as the primary tool because it detects marrow edema, disc involvement, and soft-tissue extensions (abscesses) with high sensitivity and specificity. In clinical practice, this is complemented by other studies to provide a complete picture.

MRI is the best single test for this condition because it shows early inflammatory changes in the vertebral bodies and intervertebral discs, can delineate the extent of infection, and identifies associated soft-tissue complications such as epidural or psoas abscesses. A baseline X-ray is often obtained as part of initial assessment; although it may be insensitive early and mainly shows late-stage changes like endplate destruction or disc space narrowing, it offers a readily available structural overview and helps guide further imaging. Nuclear imaging, including bone scintigraphy or leukocyte-labeled scans (and increasingly PET/CT in many centers), is useful for detecting infection when MRI is unavailable, contraindicated, or when there is suspicion of multifocal involvement; it can survey the entire skeleton to pick up additional sites of infection that MRI might miss in a single region.

Together, MRI, X-ray, and nuclear imaging provide the most practical and comprehensive approach to evaluating vertebral osteomyelitis in real-world settings.