Double pre-retinal vascular loop.

Case Report A 21-year-old male African Negro was admitted to hospital with pneumonia. Routine examination of the right fundus revealed a prominent vascular loop arising from the nasal aspect of the physiological cup at about 5 o'clock (Figure). It was superior to the inferior nasal vein and projected about 4 dioptres into the vitreous. One limb ran parallel to the visual axis and then curved superiorly; after twisting anticlockwise through 1800, it formed a second limb which passed inferiorly to the first and then returned to the disc running parallel to the first limb. The loop swayed with ocular movement and cast a shadow on the retina. The relatively dark colour and large calibre of the vessel indicated its probable venous nature.