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Sağlık Bakanlığı Ankara Eğitim ve Araştırma Hastanesi Nöroşirürji Kliniği, Cebeci-Ankara A 70-year-old male was admitted with a diagnosis of subarachnoid hemorrhage. There were no pathological findings on digital substraction angiography. He was hospitalized 6 weeks after the hemorrhage when magnetic resonance imaging revealed a 10 mm lesion on the course of the posterior inferior cerebellar artery. Digital substraction angiography showed an 8 mm aneurysm on the distal left posterior inferior cerebellar artery. The distal posterior inferior cerebellar artery aneurysm was clipped by a suboccipital median approach. The patient was discharged on the postoperative 7th day without any neurological deficit. Subarachnoid hemorrhages with an unknown origin should be reassessed with magnetic resonance imaging and digital substraction angiography as it may not be possible to make a definite diagnosis with early investigations. Anahtar Kelimeler : Intracranial aneurysm, cerebellar artery aneurysm, vertebral artery