Congenital retinal macrovessel associated with vitreous hemorrhage.

A "congenital retinal macrovessel" (CRM) is an aberrant retinal vessel (frequently a vein) that traverses the central macula and supplies or drains both above and below the horizontal raphe. It is an uncommon entity that is usually disclosed on routine examination and may rarely cause a compromised visual acuity. We describe the case of an adolescent girl who underwent vitrectomy for vitreous hemorrhage and was found to have a CRM with vascular abnormalities. To our knowledge, this is the first report of vitreous hemorrhage secondary to a CRM.