Familial occurrence of intracranial aneurysms.

Intracranial aneurysms occurring in three families are reported. As a result of the discovery of splenic artery aneurysms in one of the family members the relation between intracranial aneurysms and aneurysms in other sites is discussed. It is put forward that aneurysms might be a part of a generalized connective tissue disease, and the relation between aneurysms and some connective tissue diseases is stressed. At present extensive angiographic investigations in family cases cannot be recommended in every family.