RT Journal Article SR Electronic T1 Aqueductal blood clot as a cause of acute hydrocephalus in subarachnoid hemorrhage. JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 1183 OP 1186 VO 17 IS 6 A1 Yoshimoto, Y A1 Ochiai, C A1 Kawamata, K A1 Endo, M A1 Nagai, M YR 1996 UL http://www.ajnr.org/content/17/6/1183.abstract AB We describe two patients with acute hydrocephalus, in whom CT scans did not show intraventricular hemorrhage unequivocally. Midline sagittal MR imaging revealed a blood clot plugging the aqueduct. MR imaging is useful for detecting sub-acute clots within the aqueduct and for differentiating them from other entities.