Blood Blister−Like Aneurysms at the Junction of the Internal Carotid and Posterior Communicating Artery: Characteristics and Treatment Strategies

Blood blister-like aneurysms (BBAs) usually arise from the anterior walls of the internal carotid artery, and such lesions at the junction of the internal carotid artery and posterior communicating artery (PCoA) have not been reported to date. Here, we report our experiences of BBAs at PCoA. We studied their clinical and angiographical characteristics including the internal carotid-PCoA angle, an indicator of hemodynamic stress at the bifurcation.