The author reviews his personal experience in the surgical treatment of 325 patients presenting intracranial aneurysms. The patients were operated at Cristo Redentor Hospital between January 1979 and December 1986. Pre and post surgical management of sub-arachnoid haemorrhage and its complications is described. Internal carotid aneurysms were 122; anterior carotid artery, 100; middle cerebral artery, 69; vertebro-basilar system, 4; and multiple aneurysms, 30. 321 of those aneurysms were approached directly. 177 patients Grade I were surgically treated, with a mortality rate of 5.08%; 78 in Grade II with mortality rate of 16.66%; 55 in Grade III with mortality rate of 36.36%; and 15 in Grade IV with mortality rate of 66.6%. The general mortality rate was 16%. The results of surgeries in the former group (1961-1978) of 277 patients were compared to the group of 325 cases. The final mortality rate in 552 operated patients in the two groups is 18.11%.