Subarachnoid Hemorrhage Due to Ruptured Saccular Aneurysm of the Internal Carotid-Posterior Communicating Artery with Internal Carotid Artery Dissection: A Case Report

Abstract

A 49-year-old woman developed a sudden onset of headache and was diagnosed with a subarachnoid hemorrhage. Although a computed tomography (CT) performed at admission showed an absence of aneurysms, dissection of left carotid artery was indicated. Given the irregularity of the patient’s right carotid artery, a conservative treatment was performed. However, the follow-up angiography confirmed the appearance of an internal carotid-posterior communicating artery aneurysm. As the intraoperative findings revealed the aneurysm to be independent of the dissection and the aneurysm had the neck, the aneurysm was completely clipped. In this paper, we discuss the diagnosis of unknown subarachnoid hemorrhages and their treatment. Finally, we report a rare case and review the related literature.