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This rare type of neurofibromatosis usually affects people after age 20. On average, symptoms appear between ages 25 and 30. Schwannomatosis causes tumors to develop on the cranial, spinal and peripheral nerves — but rarely on the nerve that carries sound and balance information from the inner ear to the brain.
Neurofibromatosis disorders, including neurofibromatosis type 1, neurofibromatosis type 2, and schwannomatosis, are complex genetic conditions that can affect many different organ systems in the body. A common feature of these disorders is the tendency for benign, or noncancerous, tumors to develop, mostly on the nerves, spine, brain, and skin.
The disorders are known as neurofibromatosis type 1 (NF1) and neurofibromatosis type 2 (NF2). NF1 is the more common type of neurofibromatosis. Schwannomatosis has recently been identified as a ...
Neurofibromatosis Type 1 (NF1) Neurofibromatosis Type 1 is the more common form of the disease, occurring in 1 in 3,000 to 4,000 births. Also known as von Recklinghausen disease, NF1 mostly affects nerves of the outer parts of the body (peripheral nervous system).
There are three types of neurofibromatosis: Type 1 (NF1) causes skin changes and deformed bones. It usually starts in childhood. Sometimes the symptoms are present at birth. Type 2 (NF2) causes hearing loss, ringing in the ears, and poor balance. Symptoms often start in the teen years. Schwannomatosis causes intense pain. It is the rarest type.
Type 2 neurofibromatosis (Nf2) Bilateral neurofibromatosis, or Nf2, normally stems from a mutation, rather than a deletion, of the Nf2 gene. It is transmitted on a different chromosome to Nf1.