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ouT one-half of the aneurysms of the extracraniul internal carotid artery are of arteriosclerotic origin. Traumatic, mycotic and erosive aneurysms make up the remainder. 23 Significant problems caused by the arteriosclerotic lesions are mainly ischemic. They arise by 1) thrombosis and occlusion, ~2 ~) distal cmbolization, and 3) diminished flow because of kinking of the tortuous distal vessel. 9 Treatment has been only palliative until recent years. Mott's introduction of ligation of the carotid artery in 18~1 led to gradually increasing use of this procedure, later combined with ancillary measures. 4 Only in the past decade has definitive therapy in the form of resection come into use.

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