Syringomyelia is a cyst-like collection of cerebrospinal fluid (CSF) that forms in the spinal cord. Over time, it may damage the spinal cord.

Syrinx

The fluid-filled cyst is called a syrinx. The spinal fluid buildup may be caused by:

• Birth defects (especially Chiari malformation, in which part of the brain pushes down onto the spinal cord at the base of the skull)
• Spinal cord trauma
• Tumors of the spinal cord

The fluid-filled cyst usually begins in the neck area. It expands slowly, putting pressure on the spinal cord and slowly causing damage.

Onset of syringomyelia is usually between 25 to 40 years old. Males are more affected than females.

If the condition is due to birth defects, there may be no symptoms until age 30 to 40 years. Symptoms of syringomyelia usually appear slowly and worsen over many years. In the case of trauma, onset of symptoms may be as early as 2 to 3 months of age. If there are symptoms, they may include:

• Headache
• Scoliosis (in children)
• Loss of muscle mass (wasting, atrophy), often in the arms and hands
• Loss of reflexes in upper limbs
• Increased reflexes in lower limbs
• Spasms or tightness in the leg or hand and arm muscles
• Muscle function loss, loss of ability to use arms or legs
• Numbness that decreases the feeling of pain or temperature; lowers the ability to feel when the skin is being touched; occurs in the neck, shoulders, upper arms, and trunk in a cape-like pattern; and slowly gets worse over time
• Pain down the arms, neck, or into the middle back or legs
• Weakness (decreased muscle strength) in the arms or legs
• Painless burn or injury of the hand
• Difficulty walking or toe walking in children
• Uncontrollable movements of the eyes (nystagmus)
• Condition that affects the nerves to the eye and face (Horner syndrome)

The health care provider will perform a physical exam and ask about the symptoms, focusing on the nervous system. Tests that may be done include:

• MRI of the head and spine
• Spinal CT scan with myelogram (may be done when an MRI is not possible)

There is no known effective treatment for syringomyelia. The goals of treatment are to stop the spinal cord damage from getting worse and to improve function.

Surgery may be needed to relieve pressure in the spinal cord. Physical and occupational therapy may be needed to improve muscle function.

Ventriculoperitoneal shunting or syringosubarachnoid shunting may be needed. This is a procedure in which a catheter (thin, flexible tube) is inserted to drain the fluid buildup.

Without treatment, the disorder may get worse very slowly. Over time, it may cause severe disability.

Surgery usually stops the condition from getting worse. Nervous system function will improve in about 30% of the people who have surgery.

Without treatment, the condition may lead to:

• Loss of nervous system function
• Permanent disability

Possible complications of surgery include:

• Infection
• Other complications of surgery

Contact your provider if you have symptoms of syringomyelia.

There is no known way to prevent this condition, other than avoiding injuries to the spinal cord. Getting treated right away slows the disorder from getting worse.

Batzdorf U. Syringomyelia. In: Shen FH, Samartzis D, Fessler RG, eds. Textbook of the Cervical Spine. Philadelphia, PA: Elsevier Saunders; 2015:chap 29.

Benglis DM, Jea A, Vanni S, Shah AH, Green BA. Syringomyelia. In: Garfin SR, Eismont FJ, Bell GR, Fischgrund JS, Bono CM, eds. Rothman-Simeone and Herkowitz's The Spine. 7th ed. Philadelphia, PA: Elsevier; 2018:chap 94.

Roguski M, Groves ML. Adult syringomyelia. In: Winn HR, ed. Youmans and Winn Neurological Surgery. 8th ed. Philadelphia, PA: Elsevier; 2023:chap 334.