What is schwannomatosis?
Schwannomatosis is a newly recognized neurofibromatosis that is genetically and clinically distinct from NF1 and NF2. Like NF2 it occurs rarely. Inherited forms of the disorder account for only 15 percent of all cases. Researchers still don’t fully understand what causes the tumors and the intense pain that are characteristics of the disorder.
What are the signs and symptoms of schwannomatosis?
The distinguishing feature of schwannomatosis is the development of multiple schwannomas everywhere in the body except on the vestibular nerve. The dominant symptom is excruciatingly intense pain, which develops when a schwannoma enlarges, compresses nerves, or presses on adjacent tissue. Some people experience additional neurological symptoms, such as numbness, tingling, or weakness in the fingers and toes. Patients with schwannomatosis never have neurofibromas.
About one-third of those with schwannomatosis have tumors limited to a single part of the body, such as an arm, a leg, or a segment of the spine. Some people develop many schwannomas; others develop only a few.
What is the prognosis for someone with schwannomatosis?
Anyone with schwannomatosis experiences some degree of pain, but the intensity varies. A small number of people have such mild pain that they are never diagnosed with the disorder. Most people have significant pain, which can be managed with medications or surgery. In some extreme cases, pain will be so severe and disabling it will keep people from working or leaving the house.
How is schwannomatosis treated?
There is no currently accepted medical treatment or drug for schwannomatosis, but surgical management is often effective. When tumors are completely removed pain usually subsides, although it may recur if new tumors form. When surgery isn’t possible, ongoing monitoring and management of pain in a multidisciplinary pain clinic is advisable.
Are there prenatal tests for the neurofibromatoses?
Clinical genetic testing can confirm the presence of a mutation in the NF1 gene with an accuracy of 95 percent. Some families and doctors may choose to use a genetic test to confirm an uncertain diagnosis when there is no family history of the disorder and when waiting for additional symptoms to appear would put an unnecessary emotional burden on the family. Prenatal testing for the NF1 mutation is also possible using amniocentesis or chorionic villus sampling procedures. Genetic testing for the NF2 mutation is sometimes available but is accurate in only 65 percent of those tested. Genetic counselors can provide information about these procedures and help families cope with the results.
Where can I get more information?
For more information on neurological disorders or research programs funded by the National Institute of Neurological Disorders and Stroke, contact the Institute's Brain Resources and Information Network (BRAIN) at:
BRAIN
P.O. Box 5801
Bethesda, MD 20824
(800) 352-9424
Best to all
Raydean
