{"id":"52e6e73a-f5d0-4f0c-a053-9f4ddd31ba55","slug":"spontaneous-disappearance-of-a-small-unruptured-cerebral-aneurysm-in-the-clinoid-segment-of-the-internal-carotid-artery-a-case-report-and-literature-review","title":"Spontaneous disappearance of a small unruptured cerebral aneurysm in the clinoid segment of the internal carotid artery: A case report and literature review","authors":["Koki Onodera","Kuya Azekami","Noriyuki Yahagi","Ryutaro Kimura","Ryuta Kajimoto","Masataka Yoshimura","Shinya Kohyama"],"abstract":"Background: Various degrees of thrombosis have been reported in patients with giant aneurysms. However, small, unruptured aneurysms rarely resolve spontaneously. Herein, we report a case of a small unruptured aneurysm in the clinoid segment (C3) of the left internal carotid artery (ICA) that showed almost complete occlusion at the 1-year follow-up. Case Description: A 66-year-old woman developed a subarachnoid hemorrhage on the left side of the perimesencephalic cistern. Cerebral angiography performed on admission revealed no evidence of hemorrhage. Subsequent cerebral angiography on day 12 revealed a dissecting aneurysm on a branch of the superior cerebellar artery (SCA), and the patient underwent parental artery occlusion with 25% n-butyl-2-cyanoacrylate. The postoperative course was uneventful, and the patient was discharged on day 22 with a modified Rankin Scale score of 1. The 1 year follow-up cerebral angiogram demonstrated that the dissecting aneurysm in the SCA branch remained occluded. Notably, a small 2-mm unruptured aneurysm in the clinoid segment (C3) of the left ICA, which was present at the onset of subarachnoid hemorrhage, was almost completely occluded without intervention. Magnetic resonance angiography 1 year after spontaneous resolution of the aneurysm showed no apparent recurrence. Conclusion: This case highlights that even small, unruptured aneurysms can develop spontaneous occlusions.","thumbnailUrl":"https://sni-digital-videos.s3.amazonaws.com/articles/52e6e73a-f5d0-4f0c-a053-9f4ddd31ba55/featured/hero-1781559303774.png","publishDate":"2024-08-23T00:00:00.000Z","doi":"10.25259/SNI_493_2024","categories":["Neurovascular","Case Report"],"fullTextUrl":"https://surgicalneurologyint.com/api/articles/52e6e73a-f5d0-4f0c-a053-9f4ddd31ba55/pdf"}