title: Clonal chromosome abnormalities in a plexiform cellular schwannoma.
abstract: Cellular schwannomas are uncommon tumors of Schwann cells that can rarely have a plexiform architecture. Cellular schwannomas can be confused with low-grade malignant peripheral nerve sheath tumors (MPNST) but have been noted to have a benign clinical course. There are few published cytogenetic analyses of cellular schwannomas and, to our knowledge, there are no reports of the plexiform variant of cellular schwannoma to date. Cellular schwannomas are reported to have cytogenetic changes similar to those seen in benign schwannomas with near-diploid karyotypes having simple numerical changes often involving chromosomes 22, 7, and the sex chromosomes. MPNST are markedly different, with extensive genetic heterogeneity and complex karyotypes. We report clonal numerical changes in a cellular schwannoma with plexiform architecture: 47,XY,+17 and 48,XY,+17,+18. These findings add to the karyotypic spectrum of peripheral nerve sheath tumors.
authors.affiliation: Department of Pathology and Cytogenetics Laboratory, University of New Mexico Health Sciences Center, Albuquerque, NM 87131, USA. njoste@salud.unm.edu
authors.forename: Nancy E
authors.initials: NE
authors.lastname: Joste
authors.forename: Mark I
authors.initials: MI
authors.lastname: Racz
authors.forename: Karen Dyer
authors.initials: KD
authors.lastname: Montgomery
authors.forename: Skip
authors.initials: S
authors.lastname: Haines
authors.forename: J David
authors.initials: JD
authors.lastname: Pitcher
mesh_terms: D002869:Chromosome Aberrations; D002892:Chromosomes, Human, Pair 22 / Q000235:genetics; D002897:Chromosomes, Human, Pair 7 / Q000235:genetics; D002999:Clone Cells; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007223:Infant; D007621:Karyotyping; D008297:Male; D009442:Neurilemmoma / Q000145:classification* / Q000235:genetics* / Q000473:pathology; D012729:Sex Chromosome Aberrations