Which statement best supports a clinical diagnosis of spinal stenosis when correlating imaging?

• A. Neurogenic claudication with leg pain and walking tolerance improved by flexion.
• B. MRI or CT demonstrates canal or foraminal narrowing.
• C. Plain X-ray shows canal narrowing.
• D. Ultrasound can reliably detect canal narrowing.

Answer: (B)

Direct visualization of a narrowed spinal canal or foramina on MRI or CT provides the strongest imaging support for spinal stenosis when it’s lined up with the patient’s typical symptoms. MRI and CT let you see exactly where the narrowing is and what’s causing it—disc bulge, ligamentum flavum thickening, facet hypertrophy, or osteophytes—and they show whether neural structures are being compressed. This concrete anatomic evidence ties the clinical picture of neurogenic claudication to a tangible structural finding.

Neurogenic claudication that improves with flexion is a helpful clinical sign, but by itself it isn’t imaging proof of stenosis. Plain X-ray can hint at degenerative changes or positional narrowing, yet it fails to reliably quantify stenosis or reveal soft-tissue compression. Ultrasound cannot adequately image the spinal canal, so it isn’t a reliable method for detecting canal narrowing.