Unilateral vascular abnormality: A case of peripheral retinal arteriolar tortuosity associated with a prepapillary vascular loop

PURPOSE: To report a case of unilateral prepapillary vascular loop along with peripheral third order retinal arteriolar tortuosity in the same eye, and to discuss potential diagnostic considerations. OBSERVATIONS: Color fundus pictures and wide-angle fluorescein angiography (FA) demonstrated a pre-papillary vascular loop and a region of retinal arteriolar tortuosity in third order arterioles superotemporally in the left eye. The examination and ancillary testing on the right eye were normal. CONCLUSION AND IMPORTANCE: The vascular abnormality in this case does not fit a pattern present in other disease states both hereditary or acquired. The patient's immediate family do not demonstrate a similar abnormality and the patient remains visually asymptomatic upon one-year follow-up.