NF1 or neurofibromatosis type 1 is a genetic condition characterised by changes in skin colouring (pigmentation) and the growth of tumours along nerves in the skin, brain, and other parts of the body. The signs and symptoms of this condition vary widely among affected people.
Neurofibromatosis type 1 occurs in 1 in 3,000 to 4,000 people worldwide. Mutations in the NF1 gene cause neurofibromatosis type 1. Neurofibromatosis type 1 is considered to have an autosomal dominant pattern of inheritance. In about half of cases, the altered gene is inherited from an affected parent. The remaining cases result from new mutations in the NF1 gene and occur in people with no history of the disorder in their family.