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What is schwannomatosis?

Schwannomatosis is a rare form of neurofibromatosis. Schwannomatosis is a disorder that is genetically and clinically distinct from neurofibromatosis type 1 (NF1) and neurofibromatosis type 2 (NF2). Inherited forms of the disorder account for only 15 percent of all cases. Researchers have identified a mutation of the SWI/SNF-related matrix-associated actin-dependent regulator of chromatin subfamily B member 1 (SMARCB1)/INI1 gene that is associated with the familial form of the disorder, but they do not fully understand what causes the intense pain that characterizes this disorder.

This answer is based on source information  from the National Institute of Neurological Disorders and Stroke.

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