title: Acute hydrocephalus in nonaneurysmal perimesencephalic hemorrhage: evidence of CSF block at the tentorial hiatus.
abstract: The acute hydrocephalus in patients with nonaneurysmal perimesencephalic hemorrhage suggests an extraventricular obstruction of CSF flow. We studied the occurrence of acute hydrocephalus and the site of cisternal blood in 40 consecutive patients with perimesencephalic hemorrhage. In all 11 patients with hydrocephalus, all perimesencephalic cisterns were filled with blood; this occurred in only five of the 29 patients (17%) without hydrocephalus (p less than 0.0001). We conclude that in the absence of intraventricular blood, filling of all perimesencephalic cisterns with blood is a necessary factor for the development of acute hydrocephalus.
authors.affiliation: University Department of Neurology, Utrecht, The Netherlands.
authors.forename: G J
authors.initials: GJ
authors.lastname: Rinkel
authors.forename: E F
authors.initials: EF
authors.lastname: Wijdicks
authors.forename: M
authors.initials: M
authors.lastname: Vermeulen
authors.forename: J T
authors.initials: JT
authors.lastname: Tans
authors.forename: D
authors.initials: D
authors.lastname: Hasan
authors.forename: J
authors.initials: J
authors.lastname: van Gijn
mesh_terms: D000208:Acute Disease; D000328:Adult; D000368:Aged; D002555:Cerebrospinal Fluid / Q000502:physiology; D006801:Humans; D006849:Hydrocephalus / Q000000981:diagnostic imaging / Q000209:etiology* / Q000503:physiopathology; D002532:Intracranial Aneurysm; D008636:Mesencephalon / Q000000981:diagnostic imaging; D008875:Middle Aged; D013345:Subarachnoid Hemorrhage / Q000150:complications* / Q000000981:diagnostic imaging / Q000503:physiopathology; D014057:Tomography, X-Ray Computed