An unusual variant of the fronto-orbital artery.

A patient with a rare variation of the fronto-orbital artery is presented. In this case, the fronto-orbital artery arises from the A1 segment of the contralateral anterior cerebral artery. The angiographic findings in this case are illustrated and discussed. The importance of recognizing this variant is related to the planning of surgery or endovascular therapy in the anterior cerebral artery region.