title: Endodermal cyst ventral to the lower brain stem.
abstract: A 28-year-old woman presented with a rare case of endodermal cyst located ventral to the lower brain stem manifesting as recurrent aseptic meningitis. Computed tomography and magnetic resonance imaging demonstrated a cystic mass located ventral to the lower brain stem and extending from the prepontine to the upper cervical (C-2) cistern. The lesion was totally removed through a retrosigmoid craniotomy and C1-2 hemilaminectomy. Histological and immunohistochemical examination showed the cyst was derived from the endoderm. The histological diagnosis was endodermal cyst. Early diagnosis and surgical removal are important for patients with these cysts.
authors.affiliation: Department of Neurosurgery, National Hospital Organization Yokohama Medical Center, Yokohama, Kanagawa, Japan. shigeo-m@mui.biglobe.ne.jp
authors.forename: Shigeo
authors.initials: S
authors.lastname: Matsunaga
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Fujitsu
authors.forename: Saburo
authors.initials: S
authors.lastname: Yagishita
authors.forename: Teruo
authors.initials: T
authors.lastname: Ichikawa
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Takemoto
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Takeda
authors.forename: Kousuke
authors.initials: K
authors.lastname: Miyahara
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Niino
authors.forename: Takeki
authors.initials: T
authors.lastname: Shiina
mesh_terms: D000328:Adult; D020295:Brain Stem Neoplasms / Q000473:pathology* / Q000601:surgery; D018240:Endodermal Sinus Tumor / Q000473:pathology* / Q000601:surgery; D005260:Female; D006801:Humans