title: Endodermal epithelial cyst in the prepontine cistern extending into the fourth ventricle--case report.
abstract: The authors report a case of epithelial cyst, which recurred 32 years after the initial surgical treatment. Computed tomography showed no abnormality, but magnetic resonance (MR) imaging clearly demonstrated a well-demarcated mass in the prepontine cistern, extending into the fourth ventricle. The lesion showed extreme hyperintensity compared with the surrounding brain on both the T1- and T2-weighted images. The ultrastructural features of the cyst suggested an endodermal origin. MR imaging and electron microscopy are essential for correct diagnosis and exact pathogenetic identification of intracranial cystic lesions.
authors.affiliation: Department of Neurosurgery, Kitano Medical Research Institute and Hospital, Osaka, Japan.
authors.forename: O
authors.initials: O
authors.lastname: Hirai
authors.forename: A
authors.initials: A
authors.lastname: Kondo
authors.forename: H
authors.initials: H
authors.lastname: Kusaka
mesh_terms: D001927:Brain Diseases / Q000473:pathology*; D002552:Cerebral Ventricles / Q000473:pathology*; D003560:Cysts / Q000473:pathology*; D004707:Endoderm; D004848:Epithelium / Q000473:pathology; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011149:Pons / Q000473:pathology; D012008:Recurrence