title: Slit defect of the diaphragma sellae with valve effect: observation of a "slit valve".
abstract: Malformations of the diaphragma sellae may permit transdiaphragmatic cerebrospinal fluid pulsations that lead to expansion of the sella turcica. The purpose of this report is to describe an intrasellar arachnoid cyst observed during surgery being filled by the action of an apparent one-way valve.
authors.affiliation: Department of Surgery (Neurosurgery Service), Massachusetts General Hospital, Harvard Medical School, Boston.
authors.forename: G W
authors.initials: GW
authors.lastname: Hornig
authors.forename: N T
authors.initials: NT
authors.lastname: Zervas
mesh_terms: D016080:Arachnoid Cysts / Q000000981:diagnostic imaging / Q000209:etiology* / Q000503:physiopathology; D002555:Cerebrospinal Fluid; D004172:Diplopia / Q000209:etiology; D006801:Humans; D007427:Intracranial Pressure; D008297:Male; D008875:Middle Aged; D009408:Nerve Compression Syndromes / Q000209:etiology*; D009897:Optic Chiasm; D010902:Pituitary Gland / Q000473:pathology; D011859:Radiography; D012658:Sella Turcica / Q000002:abnormalities*; D014786:Vision Disorders / Q000209:etiology*