Abstract

Arterial aneurysms of the PICA are rare. They account for either 1% or less [1,2] or up to 3% of all the intracranial aneurysms in different casuistic [3-5]. As rule they are located at the origin of the artery from the vertebral artery. Approximately 15% of these PICA aneurysms occur distally to the origin of the artery itself [5], a fact which indicates distal PICA aneurysms to be exceedingly rare: 268 of 9709 in Lehto et al. series [5], 60 of 2169 in Peluso et al. series [4], 27 patients from 1989 to 1997 in the Bertalanffy et al. review article [3]

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