title: [An unusual and misleading form of pilocytic astrocytoma].
abstract: Pilocytic astrocytoma is histologically characterized by a biphasic pattern. We report a myxoid form of frontocallosal pilocytic astrocytoma in a 13-year-old girl. MRI showed a relatively well-defined tumor with necrosis and ring-like zone of contrast enhancement. Histological examination showed a monophasic tumor composed of piloid cells on a myxoid background corresponding to a pilomyxoid astrocytoma. This unusual form of pilocytic astrocytoma can be mistaken for a high grade infiltrating glioma. Pilomyxoid astrocytoma is more aggressive than classic pilocytic astrocytoma and has to be distinguished from it.
authors.affiliation: Laboratoire d'Anatomie Pathologique, Laboratoire d'Anatomie Pathologique, Hôpital Pasteur, 30 avenue de la voie romaine, 06000 Nice. burel-vandenbos.f@chu-nice.fr
authors.forename: Fanny
authors.initials: F
authors.lastname: Burel-Vandenbos
authors.forename: Anne
authors.initials: A
authors.lastname: Jouvet
authors.forename: Stéphane
authors.initials: S
authors.lastname: Chanalet
authors.forename: Michel
authors.initials: M
authors.lastname: Lonjon
authors.forename: Nathalie
authors.initials: N
authors.lastname: Cardot-Leccia
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Michiels
mesh_terms: D000293:Adolescent; D001254:Astrocytoma / Q000473:pathology* / Q000601:surgery; D015415:Biomarkers; D003937:Diagnosis, Differential; D005260:Female; D005904:Glial Fibrillary Acidic Protein / Q000032:analysis; D006801:Humans; D008279:Magnetic Resonance Imaging; D016896:Treatment Outcome
chemical_list: D015415:Biomarkers; D005904:Glial Fibrillary Acidic Protein