The first clear description of cerebral aneurysm, as a symmetrical dilatation of both posterior communicating arteries, was by Morgagni, in 1761. Biumi of Milan reported the first ruptured intracranial aneurysm in 1778, and Briton collected 40 pathologically verified cases from the literature1 in 1851. Hutchinson,2 in 1875, reported the first case of an intracranial aneurysm diagnosed 11 years before the patient's death with postmortem confirmation. The two main types of congenital aneurysm of the central nervous system are berry aneurysms and arteriovenous aneurysms.
Virchow in 1851 described the common small aneurysms which, because of their shape, were designated in 1931 by Collier as "berry" aneurysm.3-5 Berry aneurysms constitute the commonest form of cerebral aneurysm, are saccular, and arise at or near the point of bifurcation of the larger cerebral vessels (i.e., circle of Willis). They vary greatly in size, ranging from a few millimeters to several centimeters;
FOROUGHI E. Coexistence of Two Types of Congenital Cerebral Vascular Disease. Arch Neurol. 1960;3(6):732–736. doi:10.1001/archneur.1960.00450060120014
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