Acquired retinal aortic aneurysm

Acquired retinal arterial macroaneurysm has received clinical attention more than 100 years ago. In 1973, Robertson identified a retinal aortic aneurysm as a local dilatation of the retinal arterioles that occurred at the 3rd bifurcation of the retinal artery. Arterial dilatation is fusiform or small sac-like, with a diameter of 100-250 μm. It is easily distinguished from capillary microaneurysms, which are often less than 100 μm in diameter. The disease can cause macular bleeding, exudation, edema, or vitreous hemorrhage, which can lead to decreased vision.