Brain and Nerve No to Shinkei Volume 42, Issue 6 (June 1990)

MAGNETIC RESONANCE IMAGING OF SUBARACHNOID HEMORRHAGE DUE TO RUPTURED INTRACRANIAL ANEURYSM Tatsuhito Yamagami 1 , Ken-ichiro Higashi 1 , Yuzuru Tashiro 2 , Kenji Hashimoto 2 , Jun Minamikawa 2 , Yoshinori Akiyama 2 , Nobuo Hashimoto 2 , Haruhiko Kikuchi 2 1Department of Neurosurgery, Ijinkai Takeda General Hospital 2Department of Neurosurgery, Kyoto University Medical School Keyword: SAH , MRI , intracranial aneurysm , ruptured aneurysm pp.583-590
Published Date 1990/6/1
  • Abstract
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We report MRI (magnetic resonance imaging) findings of 31 cases with subarachnoid hemorrhage (SAH) due to ruptured intracranial aneurysm. Among these cases, 25 were studied within 72 hours after onset of SAH.

A resistive type MRI scanner operating at a field of 0. 2 Tesla was used in obtaining inversion recovery (IR) and saturation recovery (SR) images. IR 1500/43/400 (T1 weighted image,T1W), SR 1000/ 60 (SR image) and SR 2000/100 (T2 weighted image, T2W) were chosen for analysis. The SR image was usually adopted and coronal and/or sagittal images were added when there was enough time for examination. Slice thickness was 10 mm and slice interval was 15 mm. The scan was not necessarily aimed at the visualization of aneurysm itself.

1) In the acute phase of SAH, subarachnoidspaces near the ruptured aneurysm were appeared as isointensity areas on T1W and as high intensity areas on SR image. In the subacute phase, they were depicted as high intensity areas on both T1W and SR images, and as high intensity areas on T2W. 2) Intraventricular hemorrhage was visua-lized as a niveau-like high intensity area, especial-ly, within the posterior horns on the SR images. 3) SR and T2W images were suitable for detection of aneurysm itself. In a resistive-type scanner, small aneurysms were not easily visualized due to the lack of high resolution. However, 29% of aneuysms, which were not giant, could be visua-lized on MRI. 4) Identification of intracerebral hemorrhage and cerebral ischemia from various causes was easy on both T1W and T2W images. 5) By MRI, these abnormal findings due to SAH and other unrelated findings were understood as three-dimensional image. 6) MRI examination was useful in the cases with SAH due to ruptured intracranial aneurysms from the point of view that MRI is complementary to x-ray CT.

Copyright © 1990, Igaku-Shoin Ltd. All rights reserved.


Brain and Nerve 脳と神経
42巻6号 (1990年6月)
電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院