NF1 and neurofibromatosis: Neurofibromatosis disorder includes neurofibromatosis type 1 (NF1) that results from mutation in neurofibromin 1 gene located on chromosome 17q11 (19) and neurofibromatosis type 2 (NF2) (also called central neurofibromatosis) due to mutation of the merlin gene also known as neurofibromin 2 that is located on chromosome 22q12.