A 64 year-old man presented spells of right sided weakness, often provoled by standing up quickly. His neurology examination was completely normal.

                                                                      

Cerebral Angiogram. (Left) Right common carotid artery injection, AP neck view; (Right) Left internal carotid injection, intracranial AP view. Note that the right internal carotid artery is completely occluded. On the left internal carotid injection, one can see that the right hemisphere is supplied by collateral flow from the left. Note note that the top of the internal carotid is minimally reconstituted.

Revised05/21/06.
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