For suspected spinal epidural abscess, which imaging modality is preferred for diagnosis?

• A. MRI
• B. CT without contrast
• C. X-ray
• D. Ultrasound

Answer: (A)

MRI with gadolinium is the imaging modality of choice when spinal epidural abscess is suspected. Its superior soft tissue contrast lets you visualize the epidural space directly, detect even small collections, and distinguish an abscess from surrounding edema or phlegmon. It also shows the extent of the infection, any compression of the thecal sac or spinal cord, and associated vertebral body involvement such as discitis or osteomyelitis. This level of detail is crucial for urgent surgical planning and timely antibiotic therapy, which can prevent neurologic deterioration.

CT without contrast is far less sensitive for detecting early epidural infection or differentiating an abscess from surrounding inflammatory tissue, and plain X-ray is often normal or shows late bony changes. Ultrasound isn’t useful for imaging the spine or epidural space. If MRI isn’t available or feasible, CT with contrast can be considered, but it doesn’t match MRI for this diagnosis.