Brown-Séquard Syndrome
Spinal cord hemisection causing crossed motor and sensory deficits
ICD-10: G83.81 · systemic condition
Brown-Séquard syndrome is an incomplete spinal cord injury pattern resulting from damage to one lateral half (hemisection) of the spinal cord. First described by physician Charles-Édouard Brown-Séquard in 1849, this syndrome produces a characteristic combination of ipsilateral (same-side) motor loss and proprioception/vibration loss below the lesion, combined with contralateral (opposite-side) loss of pain and temperature sensation beginning one to two levels below the injury. This crossed pattern results from the anatomical decussation (crossing) of pain and temperature fibers in the spinothalamic tract at the cord level, while motor and dorsal column fibers travel ipsilaterally before decussating in the brainstem. Pure hemisection is rare; most patients present with a Brown-Séquard-plus syndrome with incomplete or asymmetric deficits. Penetrating trauma (stab wounds) and cervical disc herniation are among the most common causes. Spinal tumors, demyelinating disease (MS, NMOSD), and spinal AVM are other important causes. Diagnosis is clinical, confirmed by MRI demonstrating the lateralizing cord lesion. Brown-Séquard syndrome carries one of the best prognoses among incomplete spinal cord injury patterns. Approximately 75–90% of patients recover functional ambulation and most regain meaningful bladder control. Recovery may continue for one to two years after injury.
Anatomy & Pathology
The corticospinal (motor) tract and dorsal columns (proprioception, vibration, fine touch) are ipsilateral tracts — they travel on the same side as the body parts they serve until they reach the brainstem or thalamus. The spinothalamic tract (pain, temperature) crosses within a few segments of entering the cord. Hemisecting the cord on the right side therefore causes right-sided weakness and proprioception loss but left-sided pain and temperature loss below the lesion.
Symptoms
- Ipsilateral spastic motor paralysis below the lesion level
- Ipsilateral loss of proprioception and vibration sense (dorsal column deficit)
- Contralateral loss of pain and temperature sensation beginning 1–2 levels below the injury
- Ipsilateral flaccid paralysis and dermatomal sensory loss at the lesion level (segmental signs)
- Bladder dysfunction, typically urinary retention or urgency incontinence
- Ipsilateral Horner syndrome if the cervical sympathetic chain is involved
- Relative sparing of touch and pressure sensation in many cases
Causes & Risk Factors
- Penetrating trauma: stab wounds, gunshot wounds (most common traumatic cause)
- Cervical disc herniation compressing one side of the cord
- Spinal cord tumor (schwannoma, meningioma, ependymoma) with lateral cord compression
- Multiple sclerosis or NMOSD demyelinating plaque in the cord
- Spinal cord infarction from anterior spinal artery branch occlusion
Treatment Options
Conservative
- High-dose IV methylprednisolone protocol within 8 hours for traumatic cord injury (if initiated; evidence is debated)
- Inpatient rehabilitation: physical therapy, occupational therapy, bowel and bladder program
- Spasticity management: baclofen, tizanidine, physical modalities
Surgical
- Emergency decompression for compressive lesions (disc herniation, epidural hematoma, tumor)
- Spinal stabilization with instrumented fusion if bony injury causes instability
- Shunting or resection for underlying vascular malformation causing the hemisection injury
When to see a spine specialist
Any asymmetric acute myelopathy — one-sided weakness combined with contralateral pain and temperature loss — is a neurological emergency. Seek emergency evaluation immediately. MRI should be obtained within hours to identify compressive lesions amenable to surgical decompression.
Specialists Who Treat Brown-Séquard Syndrome
Find a specialist who treats brown-séquard syndrome
NPI-verified spine surgeons in your city.
- Austin, TX
- Charlotte, NC
- Chicago, IL
- Columbus, OH
- Dallas, TX
- Denver, CO
- Fort Worth, TX
- Houston, TX
- Indianapolis, IN
- Jacksonville, FL
- Los Angeles, CA
- Nashville, TN
- New York, NY
- Philadelphia, PA
- Phoenix, AZ
- San Antonio, TX
- San Diego, CA
- San Francisco, CA
- San Jose, CA
- Seattle, WA
Find a spine specialist near you
Browse NPI-listed spine surgeons and neurosurgeons who treat brown-séquard syndrome. Filter by location, insurance, and availability.
Search spine specialists →Frequently Asked Questions
Why does Brown-Séquard syndrome cause crossed deficits?
Pain and temperature fibers enter the spinal cord, synapse, and immediately cross to the contralateral spinothalamic tract within 1–2 spinal levels. Motor fibers (corticospinal tract) and proprioception/vibration fibers (dorsal columns) travel ipsilaterally within the cord and do not cross until the brainstem. A right-sided cord injury therefore causes right-sided motor and proprioceptive loss (ipsilateral) and left-sided pain/temperature loss (contralateral) — the hallmark crossed pattern.
How does Brown-Séquard compare to other incomplete spinal cord injuries?
Among incomplete spinal cord injury syndromes, Brown-Séquard has the best prognosis. Approximately 75–90% of patients ambulate independently at discharge. Central cord syndrome (most common incomplete injury) has intermediate prognosis. Anterior cord syndrome (bilateral motor loss with preserved proprioception from anterior spinal artery infarction) has the worst prognosis among incomplete patterns, with recovery in fewer than 10% of patients.
Can Brown-Séquard syndrome from a disc herniation recover without surgery?
Brown-Séquard from acute disc herniation typically warrants emergency surgical decompression, as the compressive cause is treatable and early decompression maximizes recovery. Post-operative recovery in disc-related Brown-Séquard is generally excellent due to the young age of patients and compressive (rather than destructive) mechanism. Non-surgical management is reserved for patients whose condition is improving rapidly and in whom surgical risk is prohibitive.