title: Central nervous system medulloepithelioma: a series of eight cases including two arising in the pons.
abstract: Medulloepithelioma is an uncommon childhood tumor of the central nervous system (CNS) whose histopathological appearance has been confused with medulloblastoma and other childhood primitive neuroectodermal tumors (PNETs), but which has a vastly different clinical course. The authors have reviewed the clinical features and treatment responses of eight children with these rare tumors, the largest series to date. In this series, the medulloepitheliomas were equally distributed between supratentorial and infratentorial primary sites. Four patients underwent gross- or near-total resections, one patient's tumor was partially resected, and one patient had biopsy only. Biopsy and ablative surgery were not attempted in two children with pontine tumors. Treatment included both radiation and chemotherapy (four patients), radiation alone (one patient), chemotherapy alone (one patient), and no post-operative treatment (two patients). Six patients died with a mean survival of 10 months and two are disease free with neurological impairment. Both long-term survivors underwent gross-total resections of their tumors. Postmortem examination revealed diffuse CNS tumor dissemination in four patients. Medulloepithelioma, often confused with less aggressive PNETs, can mimic intrinsic brainstem glioma, responds poorly to treatment, and is prone to CNS dissemination at the time of tumor progression.
authors.affiliation: Department of Pathology, The Children's Hospital of Philadelphia, Department of Pathology, The Children's Hospital of Philadelphia Pennsylvania, USA.
authors.forename: P T
authors.initials: PT
authors.lastname: Molloy
authors.forename: A T
authors.initials: AT
authors.lastname: Yachnis
authors.forename: L B
authors.initials: LB
authors.lastname: Rorke
authors.forename: J J
authors.initials: JJ
authors.lastname: Dattilo
authors.forename: M N
authors.initials: MN
authors.lastname: Needle
authors.forename: W S
authors.initials: WS
authors.lastname: Millar
authors.forename: J W
authors.initials: JW
authors.lastname: Goldwein
authors.forename: L N
authors.initials: LN
authors.lastname: Sutton
authors.forename: P C
authors.initials: PC
authors.lastname: Phillips
mesh_terms: D001932:Brain Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000628:therapy; D001933:Brain Stem; D002675:Child, Preschool; D003937:Diagnosis, Differential; D005260:Female; D005910:Glioma / Q000175:diagnosis; D006801:Humans; D007223:Infant; D008279:Magnetic Resonance Imaging; D008297:Male; D018302:Neoplasms, Neuroepithelial / Q000175:diagnosis* / Q000473:pathology / Q000628:therapy; D018242:Neuroectodermal Tumors, Primitive / Q000175:diagnosis; D011149:Pons; D011379:Prognosis; D014057:Tomography, X-Ray Computed