Fluorescein Angiogram of Prepapillary Vascular Loop With Associated Branch Retinal Artery Occlusion

Retinal vascular nonperfusion is noted along the inferotemporal arcade with subsequent retrograde venous and arterial filling of dye. Pulsatile blood flow within an occluded prepapillary vascular loop can be appreciated as rising and falling of an intraluminal blood column, corresponding to cardiac systole and diastole, respectively.