title: [Epithelial cyst occurring on the anterior surface of the brain stem--case report and review of the literatures].
abstract: Epithelial cysts in the posterior fossa are very rare, and only 22 cases have been reported in literatures. We report a case of epithelial cyst occurring on the anterior surface of the brain stem. A 31-year-old man was admitted to our hospital complaining of right hemiparesis and dysarthria. Plain CT showed a heterogeneous (isodense-hyperdense) mass in front of the pons, and was not enhanced after injection of contrast medium. As for findings of MRI, the tumor revealed as heterogeneous (isointense-hyperintense) mass on T1-weighted image and also heterogeneous (hypointense-hyperintense) mass on T2-weighted image. We removed partially the tumor which content was like yogurt. The histological findings of the cyst wall revealed a pseudostratified columnar ciliated epithelium.
authors.affiliation: Department of Neurosurgery, Nara Prefectural Hospital, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Hirabayashi
authors.forename: A
authors.initials: A
authors.lastname: Okazaki
authors.forename: M
authors.initials: M
authors.lastname: Nakamura
authors.forename: S
authors.initials: S
authors.lastname: Tsunoda
authors.forename: T
authors.initials: T
authors.lastname: Sakaki
mesh_terms: D000328:Adult; D001927:Brain Diseases / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D001933:Brain Stem; D003560:Cysts / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D014057:Tomography, X-Ray Computed