Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Benign schwannoma ?
    ### Response:
    What causes schwannomas? The cause of schwannomas is unknown. They sometimes occur in people with certain disorders including some types of neurofibromatosis (neurofibromatosis type 2 and schwannomatosis). In these cases, affected people have multiple tumors that are due to changes (mutations) in a gene.
    