The two types of neurofibromatosis are NF-1 and NF-2. Both cause abnormal cell growth in the central and peripheral nervous system. Each disease is inherited as an autosomal dominant trait, thus each child of an affected parent has a 50% chance of inheriting the disorder. Because there is no cure for either type of NF and treatment consists of amelioration of clinical symptoms, genetic counseling is the only preventive approach to this disease.