Unilateral congenital prepapillary vascular loop

Abstract

An 18-year-old man presented at Professor Doutor Fernando Fonseca Hospital for a first-time ophthalmology appointment with a complaint of bilateral blurred vision of several months’ duration. He had uncorrected myopia. Fundus examination of his left eye revealed a congenital prepapillary arterial loop with a figure-eight configuration along the Cloquet canal. The fellow eye was unremarkable. Prepapillary vascular loops are congenital retinal vascular anomalies that present as a twisted bundle of vessels projecting into the vitreous cavity and returning to the optic disc, usually with a benign and asymptomatic course. Although most cases are asymptomatic, observation is advised because of possible complications, such as branch retinal artery occlusion and vitreous hemorrhage.