[Cerebral ischemia originating from rotational vertebral artery occlusion caused by C5/6 spondylotic changes: a case report].

A 68-year-old man presented with sudden onset of left hemiparesis, diplopia and numbness of the left side of the body and was admitted to our hospital. MRI of the brain revealed no abnormality. However, neurological examination on admission strongly suggested ischemia of the brainstem.