The bihemispheric posterior interior cerebellar artery: anatomic variations and clinical relevance in 11 cases.

Abstract:

PURPOSE:Although the anatomic course of the posterior interior cerebellar artery (PICA) is variable, it is thought to be very rare for the artery to cross midline, with an estimated incidence of 0.1%. Bihemispheric PICA crosses midline and typically serves both PICA territories. METHODS:We present 11 cases of bihemispheric PICA discovered from retrospective angiogram review, the largest to date reported in the literature. RESULTS:Five cases were the typical bihemispheric PICA pattern, three were bihemispheric with distal vertebral hypoplasia, two cases were the vermian type, and one was atypical, with the PICA feeding a contralateral cerebellar arteriovenous malformation (AVM). The branching point to the contralateral hemisphere always occurred distal to the ascending tonsillar loop and all true bihemispheric variants had contralateral PICA aplasia. CONCLUSIONS:The true incidence of this variant may be much higher than previously thought (3.6% in the current series), and has relevance for cerebrovascular disease, including aneurysm, AVM, and ischemic stroke. Neuroradiologists, neurologists, and neurosurgeons should be aware of this potential variant.

journal_name

J Neurointerv Surg

authors

Carlson AP,Alaraj A,Dashti R,Aletich VA

doi

10.1136/neurintsurg-2012-010527

subject

Has Abstract

pub_date

2013-11-01 00:00:00

pages

601-4

issue

6

eissn

1759-8478

issn

1759-8486

pii

neurintsurg-2012-010527

journal_volume

5

pub_type

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