title: Hyperacute subarachnoid hemorrhage on T2-weighted MR images.
abstract: We describe a case of hyperacute subarachnoid and intraventricular hemorrhage from a ruptured aneurysm, which occurred while the patient was undergoing MR imaging. Compared with CSF, the blood in the subarachnoid space had slightly lower signal intensity on T2*-weighted gradient-echo images and increased signal intensity on T2-weighted spin-echo images. This finding differs from the generally accepted MR appearance of intracranial hemorrhage and should be recognized to ensure proper patient care.
authors.affiliation: Department of Radiology, University Hospital Sisters of Mercy, Zagreb, Croatia.
authors.forename: Zoran
authors.initials: Z
authors.lastname: Rumboldt
authors.forename: Miljenko
authors.initials: M
authors.lastname: Kalousek
authors.forename: Mauricio
authors.initials: M
authors.lastname: Castillo
mesh_terms: D000208:Acute Disease; D017542:Aneurysm, Ruptured / Q000175:diagnosis*; D002543:Cerebral Hemorrhage / Q000175:diagnosis; D002552:Cerebral Ventricles / Q000473:pathology; D003937:Diagnosis, Differential; D017352:Echo-Planar Imaging; D005260:Female; D006801:Humans; D002532:Intracranial Aneurysm / Q000175:diagnosis*; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D013345:Subarachnoid Hemorrhage / Q000175:diagnosis*