Clinical Presentation and Diagnosis of Cauda Equina Syndrome

Core Clinical Features

Cauda equina syndrome (CES) is characterized primarily by urinary retention (90% sensitivity), along with saddle anesthesia, bilateral radiculopathy, and bowel/bladder dysfunction, as reported by the American College of Radiology 1, 2
Bilateral radiculopathy (bilateral radicular pain, sensory disturbance, or motor weakness) is a key feature of CES, according to the British journal of neurosurgery 3, 4
New changes in bladder function with preserved control (hesitancy, poor stream, urgency) are early warning signs of CES, as noted by the British journal of neurosurgery 4
Urinary retention (most frequent and sensitive finding - 90% sensitivity) is a progressive symptom of CES, as reported by the Annals of Internal Medicine 1, 6
Motor weakness in lower extremities is a progressive symptom of CES, according to the British journal of neurosurgery 3, 4

CES is rare, with an estimated prevalence of 0.04% among patients with low back pain, as reported by the Annals of Internal Medicine 6, 8
Most commonly, CES is caused by massive midline disc herniation at L4-L5 and L5-S1 levels, as noted by the Journal of the American College of Radiology 2
No single symptom or sign has high positive predictive value in isolation, making diagnosis challenging, as reported by the British journal of neurosurgery 4

Delayed diagnosis can occur in patients without urinary retention, with a probability of CES approximately 1 in 10,000, as reported by the Annals of Internal Medicine 1
Inadequate assessment, including digital rectal examination findings with low interobserver reliability, should be interpreted cautiously, as noted by the British journal of neurosurgery 4
Late recognition of CES, by the time "white flag" symptoms appear (complete incontinence, perineal anesthesia), may result in permanent damage, as reported by the British journal of neurosurgery 4, 7