[Large aneurysm of the middle cerebral artery]

Seven surgical cases of large aneurysms (over 10 mm in diameter) are described. In 5 cases the neck of the aneurysm was closed, in 2 the aneurysmal sac was excised. Large aneurysms of the middle cerebral artery cause great difficulties in surgical closure of their necks with routinely used clips. Late results of treatment were very good in 5 cases.