A pre-retinal arterial loop causing a branch retinal artery occlusion.

Pre-retinal arterial loops are usually incidental findings during examinations in healthy individuals. They are rarely associated with arterial occlusion, with only nine previously reported cases in the literature. The authors report a case of a pre-retinal arterial loop associated with a branch retinal artery occlusion in a myopic young man. They also report the first documented optical coherence tomography scan through the loop causing the branch retinal artery occlusion.