Retinal Artery Occlusion Associated with Prepapillary Arterial Loop: A

Introduction

Prepapillary arterial loop is a rare congenital vascular^1–34 anomaly originating from a branch retinal artery and ending at the optic disc with projection into the vitreous cavity. Distinguishing it from other pathologies such as optic disc collaterals or neovascularization is crucial. There is no known association between prepapillary capillary loops and specific systemic illness. This variant of normal retinal vasculature, occurs when a developing retinal artery diverges into the vitreous cavity within Cloquet’s canal and returns back to the retina. It is usually unilateral in 80% of cases and the number of loops can vary from 1 to 10.¹⁵ Prepapillary arterial loops, also known as spirals, are classified based on their morphological appearances.¹⁵ The majority are detected on routine fundus exam and…