Diagnostic Approach to Spinal Stenosis

Clinical Presentation and Diagnosis

The American College of Physicians recommends immediate imaging for patients with severe or progressive neurologic deficits, which this patient demonstrates with bilateral weakness 1, 2
Patients with spinal stenosis typically present with bilateral leg symptoms due to compression of multiple nerve roots in the cauda equina, and relief with sitting/flexion is highly specific for this condition 4, 5, 1
Age is a risk factor for spinal stenosis, with patients older than 65 years having a positive likelihood ratio of 2.5 5, 1
Normal reflexes do not rule out stenosis, as spinal stenosis may present with preserved reflexes despite weakness 5

MRI is the preferred imaging modality for evaluating spinal stenosis and nerve root compression, providing detailed visualization of the spinal canal, cauda equina, and nerve roots 3, 3
Plain radiography is not recommended for initial evaluation of suspected spinal stenosis because it cannot visualize the spinal canal, nerve roots, or soft tissue structures 1, 2

The American College of Radiology specifies that patients with severe symptoms or significant neurological findings at initial presentation should not be delayed in receiving imaging, as this expedites definitive care 3
Delaying imaging in favor of physical therapy could miss a surgical indication and potentially worsen outcomes in a patient with progressive spinal stenosis 3, 2