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University of Wisconsin, School of Medicine and Public Health, Department of Neurological Surgery, Madison, Wisconsin, USA The antero-inferior cerebellar artery originates from the lower third of the basilar artery at the level of the pontocerebellar angle. Anteroinferior cerebellar artery aneurysms are usually located anterior to the brain stem at the level of the artery arising from the basilar artery or cerebellopontine fissure. The arising point from the basilar artery and the course of the antero-inferior cerebellar artery may be variable. Antero-inferior cerebellar artery aneurysms are very rare and make up 0.1-0.5% of all intracranial aneurysms. Clinical findings vary in patients with ruptured and unruptured aneurysms. Patients with an unruptured aneurysm are usually asymptomatic, but in case of a giant aneurysm, symptoms and findings can develop due to the mass eff ect. According to the localization of the aneurysm, surgery can be performed using the retrosigmoid, subtemporal, transpetrosal, suboccipital, far lateral or combined approach. Endovascular therapy may be an alternative in selective cases due to high recurrence rate. Anahtar Kelimeler : Antero-inferior cerebellar artery, Aneurysm, Endovascular therapy, Surgical treatment