Aneurysms arising from anterior inferior cerebellar artery-posterior inferior cerebellar artery AICA-PICA variant are exceedingly rare. We report two cases of distal AICA-PICA variant aneurysms and discuss their surgical management with emphasis on the higher risk for perforator artery injury. The etiopathogenesis of these rare aneurysms at non-branching sites remains elusive.
Gopalakrishnan, C. V., Menon, G., & Nair, S. (2009). Aneurysm of the anterior inferior cerebellar artery-posterior inferior cerebellar artery variant: Two case reports and review of literature. British Journal of Neurosurgery, 23(5), 554-556. https://doi.org/10.1080/02688690902987778