FIG 1. Case 1, 65-year-old man with SS from the ipsilateral VA and VA origin from the aortic arch.

A, Arcus aortogram shows the arch that originated from the left VA, occlusion of the left SCA, and collateral filling from cervical collaterals.

B, Selective angiogram of the left VA demonstrates SS from the ipsilateral VA.

C, Postoperative left SCA injection reveals good recanalization and filling.

D, Postoperative left VA angiogram shows lack of collateral filling of the left SCA.