Fluorescence angiography of vascular occlusions is of value in many instances. It makes possible the differentiation of truly occluded vessels from those which appear occluded due to changes in their walls. Collateral channels and vessel caliber changes can be more readily recognized. The method offers an objective measure of improved flow following thrombolytic therapy. Fluorescence photography with Polaroid film gives immediate, permanent angiograms of fine quality. Several cases are presented to illustrate these points.