title: [A very rare case of the anomalous left occipital-basilar arterial system].
mesh_terms: D001158:Arteries / Q000002:abnormalities; D001488:Basilar Artery / Q000002:abnormalities*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009778:Occipital Lobe / Q000098:blood supply*