Cauda equina syndrome is described as a lower motor neuron presentation. Which of the following is a characteristic feature?

Cauda equina syndrome is described as a lower motor neuron presentation. Which of the following is a characteristic feature?

• A. Bowel, bladder, and sexual dysfunction, sensory loss, and bladder leaking
• B. Spastic weakness with hyperreflexia in the legs
• C. Headache with neck stiffness
• D. Isolated back pain without neurological signs

Answer: (A)

Cauda equina syndrome involves compression of the lumbosacral nerve roots, which produces low motor neuron signs in the legs and pelvic organs. When these sacral roots (S2–S4) are affected, you get loss of sensation in the perineal/saddle area and dysfunction of the bowel, bladder, and sexual function due to disrupted parasympathetic and somatic pathways. The option describing bowel, bladder, and sexual dysfunction with sensory loss (and bladder leakage) best reflects this LMN involvement of the cauda equina. In contrast, spastic weakness with hyperreflexia is typical of an upper motor neuron lesion, which is not how cauda equina syndrome presents. Headache with neck stiffness points to meningeal irritation, not cauda equina compression, and isolated back pain without neurological signs wouldn’t indicate nerve-root involvement.

Cauda equina syndrome involves compression of the lumbosacral nerve roots, which produces low motor neuron signs in the legs and pelvic organs. When these sacral roots (S2–S4) are affected, you get loss of sensation in the perineal/saddle area and dysfunction of the bowel, bladder, and sexual function due to disrupted parasympathetic and somatic pathways. The option describing bowel, bladder, and sexual dysfunction with sensory loss (and bladder leakage) best reflects this LMN involvement of the cauda equina.

In contrast, spastic weakness with hyperreflexia is typical of an upper motor neuron lesion, which is not how cauda equina syndrome presents. Headache with neck stiffness points to meningeal irritation, not cauda equina compression, and isolated back pain without neurological signs wouldn’t indicate nerve-root involvement.