Condition	Characteristics
Congenital retinal macrovessel	Enlarged aberrant branch of a retinal artery or vein; may cross horizontal raphe; supplies or drains the macula; capillary bed usually is normal
Congenital vascular tortuosity	Benign condition affecting the arterioles; autosomal dominant inheritance; tends to worsen with age
Retinal arteriovenous malformation	Uniformly large, dilated, and tortuous retinal arteries and veins with arteriovenous communications
Retinal capillary hemangioma	Well-circumscribed, pinkish retinal lesion; supplied by a dilated arteriole and drained by a dilated venule, usually in the periphery; progressive; if untreated, intraretinal exudates and retinal detachment are possible
Retinal cavernous hemangioma	Cluster of intraretinal venous aneurysms; globular, reddish-blue lesion located along a retinal vein that often resembles a cluster of grapes; no feeding artery