Cilioretinal circulation and branch arterial occlusion associated with preretinal arterial loops.

Three patients had occlusion of preretinal loops and associated branch arterial occlusion. On fluorescein angiography all three eyes showed extensive cilioretinal circulation and that the occluded preretinal loops were part of the cilioretinal vascular anomaly. This supports the hypothesis that one form of preretinal arterial loop is associated with a malformation of the cilioretinal circulation.