Intraparenchymal Posterior Circulation Cerebral Aneurysm: A Case Report

Cerebral arterial aneurysms are a significant source of morbidity and mortality throughout the world. Cerebral aneurysms are well documented, with characteristic imaging findings both pre- and postrupture and typical morphologies and locations well described in the literature. Our case illustrates a rare entity of an intraparenchymal cerebral arterial aneurysm; an entity which was previously described rarely and only within the anterior circulation. We present a very rare case of an incidentally discovered, partially thrombosed posterior circulation (PICA) aneurysm fully invested within the parenchyma of the medulla.