The familial incidence of intracranial aneurysms.

The occurrence of familial cerebral aneurysms lends support to the importance of congenital factors in their pathogenesis. The information on the subject is, however, still meagre, there being less than 20 reports in literature. Earlier literature mentions the occurrence of cerebrovascular accidents in members of the same family with polycystic kidneys Tonnis and Lange-Cosack (1953) reported angiomas in several members of one family. O'Brien (1942) reported a case with a middle cerebral artery aneurysm whose twin brother might have died from an 'acute cerebrovascular episode' eight years