title: Rosette-forming glioneuronal tumors of the posterior fossa.
abstract: Rosette-forming glioneuronal tumor (RGNT) of the fourth ventricle is a rare, recently described WHO Grade I neoplasm. The authors report 6 examples of RGNT arising primarily from the cerebellar vermis. All the patients were female, and the mean age of presentation was 24.8 years. The original diagnoses included pilocytic astrocytoma, ependymoma, cerebellar dysembryoplastic neuroepithelial tumor (DNT), and oligodendroglioma. The cases showed classic pathological characteristics, although in 2 cases the lesions included DNT-like "floating neurons" involving Purkinje cells, a feature which has not been previously reported to the authors' knowledge. The clinical outcome was excellent with no recurrences after complete resection. These cases expand the known clinical and histological spectrum of this rare tumor type. Given the lack of fourth ventricle involvement in most of these cases, the authors suggest revising the name to RGNT of the posterior fossa.
authors.affiliation: Department of Neurosurgery, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
authors.forename: Manish N
authors.initials: MN
authors.lastname: Shah
authors.forename: Jeffrey R
authors.initials: JR
authors.lastname: Leonard
authors.forename: Arie
authors.initials: A
authors.lastname: Perry
mesh_terms: D000293:Adolescent; D000328:Adult; D001254:Astrocytoma / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery*; D014408:Biomarkers, Tumor / Q000032:analysis; D002528:Cerebellar Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery*; D002551:Cerebral Ventricle Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery*; D002648:Child; D003388:Cranial Fossa, Posterior / Q000469:parasitology / Q000601:surgery; D004806:Ependymoma / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D018242:Neuroectodermal Tumors, Primitive / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D009837:Oligodendroglioma / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery*; D019292:Skull Base Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery*; D013724:Teratoma / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery*
chemical_list: D014408:Biomarkers, Tumor