title: Malignant nerve sheath tumour arising in a benign ancient schwannoma.
abstract: A malignant nerve sheath tumour arising in a longstanding benign schwannoma in a 75-year-old woman is described. Malignant change of this kind is extremely rare; there appear to be only four convincing previously reported cases.
authors.affiliation: Department of Histopathology, St Thomas's Hospital Medical School, London, UK.
authors.forename: S A
authors.initials: SA
authors.lastname: Rasbridge
authors.forename: N L
authors.initials: NL
authors.lastname: Browse
authors.forename: J R
authors.initials: JR
authors.lastname: Tighe
authors.forename: C D
authors.initials: CD
authors.lastname: Fletcher
mesh_terms: D000368:Aged; D005260:Female; D006258:Head and Neck Neoplasms / Q000473:pathology*; D006801:Humans; D009442:Neurilemmoma / Q000473:pathology*