Relationship of brain aneurysm location and onset of Terson syndrome

Purpose: We studied the relationship between cerebral aneurysm/subarachnoid hemorrhage location and onset of Terson syndrome. Methods: We evaluated findings in 9 patients (13 eyes) who had undergone vitreous surgery for Terson syndrome at Aomori Prefectural Central Hospital between October 1999 and December 2002. Results: The most frequent location of cerebral aneurysm/subarachnoid hemorrhage (8 of 9 patients; 12 of 13 eyes) was the anterior connecting/communicating artery in the ring of Willis. Conclusions: Because rupture of an aneurysm in the anterior connecting/communicating artery is most likely to lead to Terson syndrome, whenever an unruptured aneurysm is detected in the anterior connecting/communicating artery, it would be best to operate on the aneurysm as soon as possible.