NF2 and neurofibromatosis type 1: In contrast, the vestibular schwannoma harbored a somatic NF2 mutation accompanied by loss of chromosome 22, while these alterations were absent in the neurofibroma and blood samples.<h4>Conclusion</h4>This case demonstrates that a vestibular schwannoma arising in a patient with neurofibromatosis type 1 can be driven by secondary somatic NF2 alterations accompanied by loss of chromosome 22.