Fig. 8.

Composite indocyanine green angiogram of eyes that had undergone scleral buckling for retinal detachment. a An illustrative case: a 66-year-old man with retinal detachment 15 months after retinal detachment surgery. There is occlusion of the superotemporal vortex where the ampulla has disappeared (arrow). Blood from the anterior choroid and regional choroidal veins belonging to the occluded vortex vein flows via the new drainage routes (arrowheads) that connect to the inferotemporal vortex vein through venous anastomoses in the horizontal watershed zone. New drainage routes are dilated and show intense fluorescence. b An illustrative case: a 62-year-old man with retinal detachment 4 months after scleral encircling. The superonasal and inferotemporal vortex veins (yellow arrows) are both occluded at their ampulla. The venous blood in the inferotemporal quadrant drains into the superotemporal vortex vein through the venous anastomosis (black arrows) in the horizontal watershed zone. The superotemporal vortex vein is dilated. The venous blood in the superonasal quadrant drains partially to the inferonasal vortex vein through the anastomosis (black arrows) in the horizontal watershed and partially to the superotemporal vertex vein through the anastomosis (arrowheads) in the vertical watershed zone. c An illustrative case: the right eye of a 60-year-old woman with retinal detachment 9 years after scleral encircling. Vortex veins in the superior hemisphere of the fundus are occluded by scleral buckling with cryopexy. The inferotemporal vortex vein provides venous drainage from the superotemporal and superonasal quadrants. Long arrows indicate the anastomoses in the horizontal watershed zone from the superotemporal quadrant, and short arrows indicate the anastomoses in the vertical watershed zone from the superonasal area. Reproduced with permission from reference 25