Neurofibromatosis

Neurofibromatosis: A genetic disorder of the nervous system that primarily affects the development and growth of neural (nerve) cell tissues, causes tumors to grow on nerves, and may produce other abnormalities.

Neurofibromatosis (NF) consists of two very different disorders: neurofibromatosis type 1 (NF1) and neurofibromatosis type 2 (NF2).