[Treatment of unruptured saccular vertebral artery aneurysm for preservation of the parent artery for advanced age people: a case report].

A 79-year-old female was referred to our hospital presenting with occipital headache. Her unruptured aneurysm was incidentally found by magnetic resonance angiography. Three dimensional computed tomographic angiography showed a saccular aneurysm located at the junction of the left vertebral artery (VA) and posterior inferior cerebellar artery (PICA) that originated from the aneurysm itself. Firstly, surgical clipping of the left PICA just distal to the aneurysm and occipital artery (OA)-PICA bypass was carried out and, secondly, endovascular treatment was performed for preservation of the parent artery.