Which imaging modalities are used to evaluate vertebral osteomyelitis?

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

Answer: (B)

Imaging for vertebral osteomyelitis relies on using tests that can detect early marrow changes, infection spread, and any resulting soft-tissue or spinal canal complications. MRI is the most powerful tool here because it picks up bone marrow edema, disc involvement, and any epidural or paraspinal abscess with high sensitivity and specificity, especially after contrast. Plain X-rays, while less sensitive early on, become helpful over time to show structural changes such as disc space narrowing, endplate irregularities, and vertebral destruction, and they’re widely available for a quick baseline assessment. Nuclear imaging, like bone scintigraphy or leukocyte-scintigraphy, adds value when MRI isn’t available or to survey the entire spine for multifocal disease, often detecting infection earlier than plain radiographs and guiding further targeted imaging. In some cases, CT provides excellent detail of cortical bone and can aid biopsy planning, but it isn’t as sensitive as MRI for early marrow involvement. Because each modality offers different strengths, using MRI together with X-ray and nuclear imaging gives the most comprehensive evaluation for vertebral osteomyelitis.