[Duplication of Basilar Artery - A Case Report].

We report a duplication of basilar artery, it is a rare variation of vessel and arisen from unfusing of a posterior longitudinal neural arteries. 71-year-old man with hypertension, was referred to our hospital for a visual disturbance. The duplication of basilar artery was incidentally discovered on a magnetic resonance imaging (MRI). MRI showed an artery lined up side by side a basilar artery in front of brain stem, it was connected from vertebral artery to anterior inferior cerebellar artery. So it was diagnosed a duplication of basilar artery. A duplication of basilar artery is not a rare variation of vessel but a comparatively few variation of vessel, because some cases of the fenestration of basilar artery were included the duplication of basilar artery on review of the literature. And it occurred to be stabilized its back flow.