Retinal macroaneurysm: natural history and guidelines for treatment.

This report describes the features and clinical significance of retinal macroaneurysm. Two groups can be defined: those with acute aneurysmal decompensation, Group I; and those with chronic aneurysmal decompensation, Group II. Haemorrhage is the main feature of the former group and exudates of the latter. Systemic and local associations are noted, and guidelines for treatment by phototherapy are discussed.