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Cauda equina syndrome results from compression of multiple lumbar and sacral nerve roots
Causes: Central disc herniation, spinal epidural abscess, malignancy, trauma, hematoma.
Consider this entity in those with back pain and radiculopathy at multiple spinal levels
Urinary retention occurs in >90% of patients
Saddle anesthesia occurs in 75%
Decreased rectal sphincter tone occurs in 60 to 80%
A post void residual volume <100 mL makes this entity very unlikely