[Intracranial aneurysms. 12-year review].

In angiographic studies of the Pathology Department and Radiology Department of the "20 of November Hospital" of the I.S.S.S.T.E. (Mexico, D.F.) from 1962 to 1974, were reviewed and 178 intracranial aneurysms in 141 patients were found. There is a two to one ratio females over males. 16.8% of the cases show multiple aneurysms and they were found to be more common during the fifth decade of life.