Stagnation thrombosis: an iris fluorescein angiography study.

Two cases of central retinal venous thrombosis with gross involvement of the arterial supply to the retina are described. The iris fluorescein angiography showed massive leakage of dye into the anterior chamber. The iris angiographic findings in 48 cases of central venous thrombosis are compared with those of 19 patients with central retinal artery occlusion. In venous obstruction pupillary and extrapupillary vessels leak both in recent and in long-standing cases, whereas in arterial occlusions extrapupillary leakage occurs exclusively in recent cases. Comparatively, the 2 cases of stagnation thrombosis appear to show an exaggerated arterial type of response, and seem to form a distinct clinical entity as opposed to the basically venous insufficiency of central retinal vein thrombosis of the usual type.