Brown Séquard Syndrome

National Organization for Rare Disorders, Inc.

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It is possible that the main title of the report Brown Séquard Syndrome is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.


  • BSS
  • Hemisection of the Spinal Cord
  • Partial Spinal Sensory Syndrome
  • Hemiparaplegic Syndrome
  • Spastic Spinal Monoplegia Syndrome

Disorder Subdivisions

  • None

General Discussion

Brown-Séquard syndrome is a rare spinal disorder that results from an injury to one side of the spinal cord in which the spinal cord is damaged but is not severed completely. It is usually caused by an injury to the spine in the region of the neck or back. In many cases, affected individuals have received some type of puncture wound in the neck or in the back that damages the spine and causes symptoms to appear.

Characteristically, the affected person loses the sense of touch, vibrations and/or position in three dimensions below the level of the injury (hemiparalysis or asymmetric paresis). The sensory loss is particularly strong on the same side (ipsilateral) as the injury to the spine. These sensations are accompanied by a loss of the sense of pain and of temperature (hypalgesia) on the side of the body opposite (contralateral) to the side at which the injury was sustained.


Symptoms of Brown-Séquard syndrome usually appear after an affected individual experiences a trauma to the neck or back. First symptoms are usually loss of the sensations of pain and temperature, often below the area of the trauma. There may also be loss of bladder and bowel control. Weakness and degeneration (atrophy) of muscles in the affected area may occur. Paralysis on the same side as that of the wound often occurs. Paralysis may be permanent if diagnosis is delayed.

Individuals with this syndrome have a good chance of recovering a large measure of function. More than 90% of affected individuals recover bladder and bowel control, and the ability to walk. Most affected individuals regain some strength in their legs and most will regain functional walking ability.


This syndrome is often a consequence of a traumatic injury by a knife or gunshot to the spine or neck. In many cases, however, it is caused by, or is the result of, other spinal disorders such as cervical spondylosis, arachnoid cyst or epidural hematomas. Brown-Séquard syndrome may also accompany bacterial or viral infections. Blunt traumas, such as occur in a fall or automobile accident, on rare occasions may be the cause of the Brown-Séquard syndrome.

The medical literature cites, as causing or being associated with BSS, the following conditions: lateral curvature of the spine (kyphosis), Chiari I malformation, methamphetamine injection in the neck, multiple sclerosis, spinal epidural hematoma, intramedullary spinal cord tumor, and myeloschisis. Among the infectious or inflammatory causes cited are: meningitis, empyema, herpes zoster, herpes simplex, myelitis, and tuberculosis.

Affected Populations

Brown-Séquard syndrome is a rare disorder that affects males and females in equal numbers. More than 500 cases have been reported to date. The incidence of Brown-Séquard syndrome has been estimated to be 2% of all traumatic spinal cord injuries. The annual incidence of all forms of spinal cord injury is estimated to be 30-40 per 1,000,000 people.

Standard Therapies

There is no specific treatment for individuals with Brown-Séquard syndrome. In most instances, treatment focuses on the underlying cause of the disorder. Treatment may involve drugs that control muscle symptoms, and there is some dispute as to whether high-dose steroid administration is effective.

Devices that help an affected individual continue daily activities such as braces, hand splits, limb supports, or a wheelchair are important. Various other aids may be necessary if the patient has difficulty breathing or swallowing. Other treatment is symptomatic and supportive.

Investigational Therapies

The National Institute of Child Health and Human Development (NICHD) is sponsoring a Phase II and Phase III clinical trial designed to improve walking ability after spinal cord injury. Patients with Brown-Sequard syndrome may be eligible to participate in the study.

It is well known that incomplete spinal cord injury often makes walking very difficult. A group of physical therapists are trying to determine the effect of treadmill speed on spinal cord function and walking performance.

Recently, evidence has been building to contradict the conventional wisdom that recovery of nerve function following spinal cord injury was not possible. It has been shown that nerve circuits (neuronal circuits) may reorganize by strengthening previously inactive connections and circuits. Sensory information related to movement is used to improve treadmill and overground walking.

About 16 persons will participate in the study, which is based at the University of Florida in Gainesville.

For further information contact:

Andea L. Behrman, PhD

Principal Investigator

University of Florida

Tel: 352-273-6117

e-mail: or

Michelle L. Woodbury, OTR, MA


Study ID number is: K01HD01348

Information on current clinical trials is posted on the Internet at All studies receiving U.S. government funding, and some supported by private industry, are posted on this government web site.

For information about clinical trials being conducted at the NIH Clinical Center in Bethesda, MD, contact the NIH Patient Recruitment Office:

Tollfree: (800) 411-1222

TTY: (866) 411-1010


For information about clinical trials sponsored by private sources, contact:



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Antich PA, Sanjuan AC, Girvent FM, et al. High cervical disc herniation and Brown-Séquard syndrome. A case report and review of the literature. J Bone Joint Surg Br. 1999;81:462-63.


Abe M. Incomplete Brown-Séquard syndrome caused by cervical kyphosis secondary to neurofibromatosis: report of a case. J Orthop Sci. 2003;8:602-06.

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Cellerini M, Bayon S, Scazzeri F, et al. Idiopathic spinal cord herniation: a treatable cause of Brown-Séquard syndrome. Acta Neurochir (Wien). 2002;144:321-25.

Sakakibara R, Hattori T, Uchiyama T, et al. Urinary dysfunction in Brown-Séquard syndrome. Neurourol Urodyn. 2001;20:661-67.

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NINDS Brown-Séquard Syndrome Information Page. Reviewed 2-25-2003. 2pp.

NINDS Spinal Cord Injury Information Page. Reviewed 7-01-2001.

Beeson MS. Brown-Séquard Syndrome. emedicine. Last Updated: July 30, 2003. 7pp

Wheeless' Textbook of Orthopaedics. Brown-Séquard syndrome. nd. - Brown-Sequard syndrome: 1p. - Incomplete Spinal Cord Lesion: 2pp. - Primary Spinal Cord Neoplasia: 1p.

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Spinal Cord Society

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American Spinal Injury Association

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Spinal Cord Injury Network International

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For a Complete Report

This is an abstract of a report from the National Organization for Rare Disorders, Inc.® (NORD). Cigna members can access the complete report by logging into For non-Cigna members, a copy of the complete report can be obtained for a small fee by visiting the NORD website. The complete report contains additional information including symptoms, causes, affected population, related disorders, standard and investigational treatments (if available), and references from medical literature. For a full-text version of this topic, see