Spontaneous involution of a large retinal arterial macroaneurysm

Background: Acquired retinal macroaneurysms are round dilatations of retina l arterioles that occur in the posterior fundus, They tend to rupture befor e they grow large and cause a visual decrease. The average diameter of macr oaneurysms in the previous reports is 281 micrometer, Methods: A 63-year-old man complained of a sudden decrease of visual acuity in the left eye, Fundus examination of his left eye revealed a large protr uded mass, 2 disc diameters in size, at the first bifurcation of the infero temporal retinal artery. Preretinal vitreous bleeding and serous retinal de tachment were observed around the lesion. Indocyanine green (ICG) angiograp hy showed this mass to be continuous with the inferotemporal retinal artery and ICG dye leaked from the retinal artery into the lumen of the mass, wit h pulsation. Results: Six months later, the large macroaneurysm underwent s pontaneous involution, Conclusion: As shown in this patient, retinal macroaneurysms may grow extre mely large. ICG angiography was useful to diagnose this large retinal arter ial macroaneurysm.