The effects of classical and microsurgical methods of exclusion of supratentorial intracranial aneurysms on the development of ischaemic changes at the site of approach to the aneurysm were studied. In cases of internal carotid artery aneurysms and middle cerebral artery aneurysms the use of microscope reduced the occurrence of ischaemic changes at the site of approach. In cases of aneurysms of the anterior cerebral artery system the frequency of these changes was similar with both methods. The size and location of these changes and the degree of psychical changes caused by them were similar with both methods.
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