ANGIOGRAPHICAL STUDY OF INTRACRANIAL SACCULAR ANEURYSM, PARTICULARLY REFERING TO ITS SIZE AND SHAPE Kazuo Mizoi 1 , Ryungchan Kwak 1 , Tetsuya Sakamoto 1 , Takatsugu Ohi 1 , Jiro Suzuki 1 1Division of Neurosurgery, Institute of Brain Disease, Tokoku University, School of Medicine pp.123-130
Published Date 1979/2/1
DOI https://doi.org/10.11477/mf.1406204366
  • Abstract
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We have investigated on the morphology of cerebral aneurysm, particularly its size and shape. Subjects were 655 cases, 655 aneurysms excluding the cases of multiple aneurysm and the cases of single aneurysm with incomplete data among 1,000 cases of direct surgery of saccular cerebral aneurysm we encountered during a period from June 1961 to Sept. 1975. Of them, 636 cases were ruptured aneurysms and 19 cases non-ruptured aneurysms.With the scale of enlargement of preoperative cerebral angiogram corrected, cerebral aneurysm was measured each in the A-P view, lateral view and oblique view at the accuracy of 0.5 mm. The largest major diameter and the smallest minor diameter among them were respectively made the maximum diameter and the minimum diameter of the cerebral aneurysm concerned.

According to the studies on the size of 636 ruptured aneurysms, the diameter of aneurysms varied from 2. 5 mm to 28 mm, and the frequency distribution showed that the frequency increased sharply from the diameter of 4 mm or more, reached its peak at 7 mm and decreased gradually from the diameter of 7 mm or more. From this distribution, it was surmised that the critical size for the rupturing of aneurysm would be in the vicinity of 4 mm.

In non-ruptured aneurysms, the diameter varied between 2 mm and 27 mm and one showing the maximum diameter of 9 mm was found most frequently.

As to the sex difference in the size of ruptured aneurysms, the size tended to be slightly larger in female ; regarding the age difference, however, there was no distinctive difference.

As to the site difference in the size of ruptured aneurysms, internal carotid artery aneurysm was shown to be the largest, followed by middle cere-bral artery aneurysm and anterior communicating artery aneurysm in this order. Regarding the shape, internal carotid artery aneurysm tended to be slender compared with aneurysms in other sites.

There also was a tendency for cerebral aneurysm to be enlarged and slender by repetition of ruptur-ing, and a similar tendency was observed when the period from SAH attack to angiography taken become longer.

Copyright © 1979, Igaku-Shoin Ltd. All rights reserved.


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