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What is transverse myelitis?
Transverse myelitis is an inflammation of the spinal cord, a major part of the central nervous system. The spinal cord carries nerve signals to and from the brain through nerves that extend from each side of the spinal cord and connect to nerves elsewhere in the body. The term myelitis refers to inflammation of the spinal cord; transverse refers to the pattern of changes in sensation—there is often a band-like sensation across the trunk of the body, with sensory changes below.
Causes of transverse myelitis include infections, immune system disorders, and other disorders that may damage or destroy myelin, the fatty white insulating substance that covers nerve cell fibers. Inflammation within the spinal cord interrupts communications between nerve fibers in the spinal cord and the rest of the body, affecting sensation and nerve signaling below the injury. Symptoms include pain, sensory problems, weakness in the legs and possibly the arms, and bladder and bowel problems. The symptoms may develop suddenly (over a period of hours) or over days or weeks.
Transverse myelitis can affect people of any age, gender, or race. It does not appear to be genetic or run in families. A peak in incidence rates (the number of new cases per year) appears to occur between 10 and 19 years and 30 and 39 years. It is estimated that about 1,400 new cases of transverse myelitis are diagnosed each year in the United States.
Although some people recover from transverse myelitis with minor or no residual problems, the healing process may take months to years. Others may suffer permanent impairments that affect their ability to perform ordinary tasks of daily living. Some individuals will have only one episode of transverse myelitis; other individuals may have a recurrence, especially if an underlying illness caused the disorder.
There is no cure for transverse myelitis. Treatments to prevent or minimize permanent neurological deficits include corticosteroid and other medications that suppress the immune system, plasmapheresis (removal of proteins from the blood), or antiviral medications.
The exact cause of transverse myelitis and extensive damage to nerve fibers of the spinal cord is unknown in many cases. Cases in which a cause cannot be identified are called idiopathic. However, looking for a cause is important, as some will change treatment decisions.
The discovery of circulating antibodies to the proteins aquaporin-4 and anti-myelin oligodendrocyte point to a definite cause in some individuals with transverse myelitis. Antibodies are proteins produced by cells of the immune system that bind to bacteria, viruses, and foreign chemicals to prevent them from harming the body. In autoimmune disorders, antibodies incorrectly bind to normal body proteins. Aquaporin-4 is a key protein that carries water through the cell membrane of neural cells. The myelin oligodendrocyte glycoprotein sits on the outer layer of myelin.
A number of conditions appear to cause transverse myelitis, including:
Immune system disorders. These disorders appear to play an important role in causing damage to the spinal cord. Such disorders are:
- aquaporin-4 autoantibody associated neuromyelitis optica
- multiple sclerosis
- post-infectious or post-vaccine autoimmune phenomenon, in which the body's immune system mistakenly attacks the body's own tissue while responding to the infection or, less commonly, a vaccine
- an abnormal immune response to an underlying cancer that damages the nervous system; or
- other antibody-mediated conditions that are still being discovered.
- Viral infections. It is often difficult to know whether direct viral infection or a post-infectious response to the infection causes the transverse myelitis. Associated viruses include herpes viruses such as varicella zoster (the virus that causes chickenpox and shingles), herpes simplex, cytomegalovirus, and Epstein-Barr; flaviviruses such as West Nile and Zika; influenza, echovirus, hepatitis B, mumps, measles, and rubella.
- Bacterial infections such as syphilis, tuberculosis, actinomyces, pertussis, tetanus, diphtheria, and Lyme disease. Bacterial skin infections, middle-ear infections, campylobacter jejuni gastroenteritis, and mycoplasma bacterial pneumonia have also been associated with the condition.
- Fungal infections in the spinal cord, including Aspergillus, Blastomyces, Coccidioides, and Cryptococcus.
- Parasities, including Toxoplasmosis, Cysticercosis, Shistosomiasis, and Angtiostrongyloides.
- Other inflammatory disorders that can affect the spinal cord, such as sarcoidosis, systemic lupus erythematosus, Sjogren's syndrome, mixed connective tissue disease, scleroderma, and Bechet's syndrome.
- Vascular disorders such as arteriovenous malformation, dural arterial-venous fistula, intra spinal cavernous malformations, or disk embolism.
In some people, transverse myelitis represents the first symptom of an autoimmune or immune-mediated disease such as multiple sclerosis or neuromyelitis optica. (Multiple sclerosis, or MS, is disease that causes distinctive lesions, or plaques, that primarily affect parts of the brain, spinal cord, and optic nerve—the nerve that carries information from the eye to the brain. Neuromyelitis optica, or NMO, is an autoimmune disease of the central nervous system that predominantly affects the optic nerves and spinal cord.) ”Partial” myelitis—affecting only a portion of the cord cross-section—is more characteristic of multiple sclerosis. Neuromyelitis optica is much more likely as an underlying condition when the myelitis is “complete” (causing severe paralysis and numbness on both sides)
Transverse myelitis may be either acute (developing over hours to several days) or subacute (usually developing over one to four weeks).
Four classic features of transverse myelitis are:
- Weakness of the legs and arms. People with transverse myelitis may have weakness in the legs that progresses rapidly. If the myelitis affects the upper spinal cord it affects the arms as well. Individuals may develop paraparesis (partial paralysis of the legs) that may progress to paraplegia (complete paralysis of the legs), requiring the person to use a wheelchair.
- Pain. Initial symptoms usually include lower back pain or sharp, shooting sensations that radiate down the legs or arms or around the torso.
- Sensory alterations. Transverse myelitis can cause paresthesias (abnormal sensations such as burning, tickling, pricking, numbness, coldness, or tingling) in the legs, and sensory loss. Abnormal sensations in the torso and genital region are common. Sometimes the shooting sensations occur when the neck is bent forward and resolve when the neck is brought back to normal position (a condition called Lhermitte's phenomenon).
- Bowel and bladder dysfunction. Common symptoms include an increased frequency or urge to use the toilet, incontinence, difficulty voiding, and constipation.
Many individuals also report experiencing muscle spasms, a general feeling of discomfort, headache, fever, and loss of appetite, while some people experience respiratory problems. Other symptoms may include sexual dysfunction and depression and anxiety caused by lifestyle changes, stress, and chronic pain.
The segment of the spinal cord at which the damage occurs determines which parts of the body are affected. Damage at one segment will affect function at that level and below. In individuals with transverse myelitis, myelin damage most often occurs in nerves in the upper back, causing problems with leg movement and bowel and bladder control, which require signals from the lower segments of the spinal cord.
Physicians diagnose transverse myelitis by taking a medical history and performing a thorough neurological examination. The first step in evaluating a spinal cord condition is to rule out causes that require emergency intervention, such as trauma or a mass putting pressure on the cord. Other problems to rule out include herniated or slipped discs, stenosis (narrowing of the canal that holds the spinal cord), abscesses, abnormal collections of blood vessels, and vitamin deficiencies. Tests that can indicate a diagnosis of transverse myelitis and rule out or evaluate underlying causes include:
- Magnetic resonance imaging (MRI) uses a strong magnetic field and radio waves to produce a cross sectional view or three-dimensional image of tissues, including the brain and spinal cord. A spinal MRI will almost always confirm the presence of a lesion within the spinal cord, whereas a brain MRI may provide clues to other underlying causes, especially MS. In some instances, computed tomography (CT), which uses x-rays and a computer to produce cross-section images of the body or an organ, may be used. Often an injection of a contrast agent is given in the middle of the scan to determine whether the contrast agent leaks out into the spinal cord. Such leakage is a telltale feature of inflammation.
- Blood tests may be performed to rule out various disorders such as HIV infection, vitamin B12 deficiency, and many others. Blood is tested for the presence of autoantibodies (anti- aquaporin-4, anti-myelin oligodendrocyte) and a host of antibodies associated with cancer (paraneoplastic antibodies) that may be found in people with transverse myelitis.
- Lumbar puncture (also called spinal tap) uses a needle to remove a small sample of the cerebrospinal fluid that surrounds the brain and spinal cord. In some people with transverse myelitis, the cerebrospinal fluid contains more protein than usual and an increased number of white blood cells (leukocytes) that help the body fight infections. A spinal tap is important to identify or rule out infectious causes.
If none of these tests suggests a specific cause, the person is presumed to have idiopathic transverse myelitis. In occasional cases, initial testing using MRI and lumbar puncture may show normal results but may need to be repeated in 5-7 days.
Treatments are designed to address infections that may cause the disorder, reduce spinal cord inflammation, and manage and alleviate symptoms.
Initial treatments and management of the complications of transverse myelitis
- Intravenous corticosteroid drugs may decrease swelling and inflammation in the spine and reduce immune system activity. Such drugs may include methylprednisolone or dexamethasone (usually administered for 3 to 7 days and sometimes followed by a tapering off period). These medications may also be given to reduce subsequent attacks of transverse myelitis in individuals with underlying disorders.
- Plasma exchange therapy (plasmapheresis) may be used for people who don't respond well to intravenous steroids. Plasmapheresis is a procedure that reduces immune system activity by removing plasma (the fluid in which blood cells and antibodies are suspended) and replacing it with special fluids, thus removing the antibodies and other proteins thought to be causing the inflammatory reaction.
- Intravenous immunoglobulin (IVIG) is a treatment thought to reset the immune system. IVIG is a highly concentrated injection of antibodies pooled from many healthy donors that bind to the antibodies that may cause the disorder and remove them from circulation.
- Pain medicines that can lessen muscle pain include acetaminophen, ibuprofen, and naproxen. Nerve pain may be treated with certain antidepressant drugs (such as duloxetine), muscle relaxants (such as baclofen, tizanidine, or cyclobenzaprine), and anticonvulsant drugs (such as gabapentin or pregabalin).
- Antiviral medications may help those individuals who have a viral infection of the spinal cord.
- Medications can treat other symptoms and complications, including incontinence, painful muscle contractions called tonic spasms, stiffness, sexual dysfunction, and depression.
Following initial therapy, it is critical part to keep the person's body functioning while hoping for either complete or partial spontaneous recovery of the nervous system. This may require placing the person on a respirator in the uncommon scenario where breathing is significantly affected. Treatment is most often given in a hospital or in a rehabilitation facility where a specialized medical team can prevent or treat problems that afflict paralyzed individuals.