skip to main content

Cauda equina syndrome — RCPSC EM MCQ

Instant feedback + full explanation. One question, done properly.

HardMusculoskeletalCauda equina syndromeRCPSC EM

CTAS 2. A 46-year-old has severe back pain, bilateral sciatica, saddle numbness, and urinary retention. Post-void residual is 650 mL. Power is reduced in ankle dorsiflexion bilaterally. He has no fever. What is the most appropriate investigation?

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: A — Urgent MRI lumbosacral spine

Back pain with saddle anaesthesia, urinary retention, and bilateral neurologic deficits requires urgent MRI and spine consultation for cauda equina syndrome.

Reference: Canadian Spine Society resources; Tintinalli's Emergency Medicine