Subarachnoid hemorrhage (SAH) occurs when a pre-existing aneurysm ruptures. Dissecting aneurysms may cause both SAH and pseudoaneurysm formation. We reviewed the records of 11 patients with pseudoaneurysms treated at our institute during the last 5 years. Six of the 11 patients had pseudoaneurysms at the anterior wall of the internal carotid (IC) artery, so-called blister-like aneurysms, while the other five patients had pseudoaneurysms at the posterior communicating artery or anterior cerebral artery. Here, we report five non-IC pseudoaneurysms in detail and compare their characteristics with those of IC pseudoaneurysms.
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