title: Intracranial aneurysms associated with a double origin of the posterior inferior cerebellar artery.
abstract: The posterior inferior cerebellar artery (PICA) frequently has a variable course and target territory. However, double origin PICA is a rare finding. Its significance is uncertain, but it has been associated with intracranial aneurysms localized at the PICA proper or at a distant site. The presence of this variation imposes specific challenges. We describe two cases of double origin PICA, one of them associated with an ipsilateral PICA aneurysm. The role of this finding was critically reviewed. A literature search identified 23 cases of double origin PICA, including both cases reported in this paper. Intracranial aneurysms were strongly associated with double origin PICA (71% in 21 detailed cases of double origin PICA). The current patient harboring a PICA aneurysm was successfully treated by endovascular trapping. In the setting of double origin PICA aneurysms, this variation beneficially affects the treatment choice once the two limbs enable the safe sacrifice of the channel involved, with preservation of blood flow through the other channel.
authors: Division of Interventional Neuroradiology, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil. felipepadovani@yahoo.com.br
authors: F
authors: F
authors: Padovani Trivelato
authors: M T
authors: MT
authors: Salles Rezende
authors: R
authors: R
authors: Brito Santos
authors: T
authors: T
authors: Hilton Vieira Madeira
authors: R
authors: R
authors: Cardoso Campos
authors: A
authors: A
authors: Cordeiro Ulhôa
mesh_terms: D000328:Adult; D002531:Cerebellum / Q000098:blood supply*; D002533:Cerebral Angiography; D006801:Humans; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging* / Q000209:etiology*; D008297:Male; D008875:Middle Aged; D020769:Posterior Cerebral Artery / Q000000981:diagnostic imaging*