Which of the following describes symptoms of cauda equina syndrome?

• A. Saddle anaesthesia, sensory-motor deficits below L1
• B. Upper limb numbness
• C. Facial droop
• D. Headache

Answer: (A)

Cauda equina syndrome arises when the nerve roots at the lower end of the spinal cord are compressed. The defining feature is saddle anesthesia—reduced or lost sensation in the perineal area, buttocks, and inner thighs—paired with sensory and motor changes in the legs that reflect involvement of the lower nerve roots (L2 through S5). Because multiple roots are affected, you see bilateral leg weakness or numbness and impaired reflexes, not confined to a single myotome. Autonomic symptoms are common too, such as urinary retention or bowel dysfunction, since the pelvic nerves share these lower roots.

This combination—saddle sensory loss plus leg involvement—directly points to cauda equina involvement, rather than issues that affect only upper limbs (upper limb numbness), the face (facial droop), or headaches, which involve different parts of the nervous system. Because the condition can rapidly worsen and lead to permanent deficits, recognizing saddle anesthesia with lower limb sensory-motor changes as a sign of cauda equina syndrome is critical and warrants urgent evaluation and management.