A middle-aged woman presents with low back pain radiating to both buttocks and legs, leg weakness, new urinary incontinence, saddle numbness, and recently lifting heavy furniture. Which condition best fits?

• A. Cauda equina syndrome
• B. Lumbar strain
• C. Spinal stenosis
• D. Piriformis syndrome

Answer: (A)

Cauda equina syndrome is a neurosurgical emergency caused by compression of the nerve roots below the conus medullaris. It presents with back pain plus bilateral leg symptoms, weakness, saddle sensory loss, and new bowel or bladder dysfunction. In this scenario, the combination of low back pain radiating to both buttocks and legs, leg weakness, saddle numbness, and new urinary incontinence after heavy lifting strongly indicates acute compression of the cauda equina, most often from a large central herniated disc. This differentiates it from lumbar strain, which would not produce bladder or saddle sensory changes; spinal stenosis, which typically features neurogenic claudication with leg pain on walking and relief with bending forward but not sudden incontinence; and piriformis syndrome, which causes buttock pain and sciatica without saddle anesthesia or urinary symptoms. This situation requires urgent MRI and neurosurgical evaluation for decompression.