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¹Ankara University, School of Medicine, Department of Neurosurgery, Ankara, Turkey DOI : 10.5137/1019-5149.JTN.18758-16.0 Aneurysm of the anterior inferior cerebellar artery (AICA) is a very rare entity, and the manifestation and manipulation of such aneurysms remain contentious. In this paper, we report a case where a successful surgery for an olfactory groove meningioma was performed and the patient discharged, but re-admitted to hospital with loss of consciousness and subsequently passed away three hours after re-admission. The patient was diagnosed with subarachnoid hemorrhage. The cause of the fatal subarachnoid hemorrhage was rupture of a new onset AICA dissecting aneurysm which had provided neither clinical nor radiological signs before the operation. We discuss the possible causes of the formation of such aneurysm. Keywords : Dissecting anterior inferior cerebellar artery aneurysm, Iatrogenic, Rupture