a. History: Saddle Anesthesia (loss of sensation around the inner thighs, buttocks, perineum)

Differential Diagnosis

Next Pivotal Assessment	Finding
MRI, Emergency*

*Lumbar spine MRI without contrast is usually appropriate. If there is concern for cancer or infection or if there is history of prior surgery at the site, MRI without and with contrast is recommended. CT with contrast is the alternative exam if MRI is contraindicated.