What are the symptoms of sacral spinal stenosis?

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Last updated: October 5, 2026 • View editorial policy

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Sacral Spinal Stenosis Symptoms

Sacral spinal stenosis presents with partial cauda equina syndrome symptoms including buttock and scrotal/perineal numbness, urinary retention, difficulty with bowel evacuation, decreased anal sphincter tone, and absent bulbocavernosus reflex 1.

Key Clinical Features

The symptom pattern differs from typical lumbar spinal stenosis and represents a medical emergency requiring urgent recognition:

Primary Symptoms

  • Perineal and genital sensory loss - numbness affecting the buttocks, scrotum (in males), or saddle region 1
  • Bladder dysfunction - urinary retention is the hallmark finding, representing acute loss of sphincter control 1
  • Bowel dysfunction - difficulty with bowel evacuation due to impaired rectal sensation and sphincter control 1
  • Radicular pain - thigh and buttock pain, often unilateral initially 1

Physical Examination Findings

  • Diminished perineal sensation to pinprick testing 1
  • Decreased anal sphincter tone on digital rectal examination 1
  • Absent bulbocavernosus reflex 1

Critical Distinction: Cauda Equina Syndrome

Sacral stenosis causes cauda equina syndrome (CES), which has different stages with vastly different outcomes 2:

CESR (CES with Retention) - The Emergency

When patients present with painless urinary retention and complete perineal anesthesia, they have CESR - this represents severe, often irreversible damage 2. These patients typically have:

  • Paralyzed, insensate bladder requiring intermittent self-catheterization
  • Manual evacuation of feces or bowel irrigation needed
  • Loss of sexual function
  • Only 48-93% show any improvement even with surgery 2

CESI (CES Incomplete) - The Window

Patients with preserved voluntary control of micturition despite bladder symptoms have CESI 2. These patients can achieve socially normal bladder control if treated urgently.

Common Pitfall

Do not wait for "classic" late CES features (painless urinary incontinence, complete perineal anesthesia, patulous anus) - these represent treatment failure, not diagnostic targets 2. The true red flags are:

  • Bilateral radicular symptoms (pain, sensory changes, or weakness)
  • Any new bladder symptoms with preserved control (hesitancy, poor stream, urgency)
  • Subjective or objective perineal sensory changes
  • New bowel difficulties 2

Radiographic Correlation

Standard lumbosacral spine films may show only minimal degenerative changes 1. Lumbar myelography or MRI reveals the critical finding: stenosis at the sacral level with compromise of lower sacral nerve roots 1. Unlike lumbar stenosis, very little contrast may descend below L5-S1 on myelography 1.

Urgency of Recognition

This is an uncommon but devastating condition requiring emergency MRI and surgical decompression (bilateral sacral laminectomy) 1. Symptoms can resolve postoperatively if caught early 1, but delayed recognition leads to permanent neurological disability affecting bladder, bowel, and sexual function 2.

References

1
Research

Partial cauda equina compromise: result of sacral stenosis.

Archives of physical medicine and rehabilitation, 1985

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