To report a case of laser photocoagulation treatment for the patient of Coats' disease accompanying a retinal macrocyst.

A three-year-old boy visited the hospital whose chief complaint was visual acuity decrease of his left eye. Fundus examination showed macular scar, foveal hard exudates and inferior retinal cystic lesion in his left eye. Two months later, examination under anesthesia (EUA) and fluorescein angiography (FAG) was performed. The results revealed inferior retinal macrocyst, nasal avascular retina and telangiectasia around the retinal macrocyst. Laser photocoagulation was performed around the retinal macrocyst and at the nasal avascular retina. One year after the laser photocoagulation, retinal macrocyst did not further progress and the retina was stabilized.

Laser photocoagulation was done around the retinal macrocyst and at the nasal avascular retina of the Coats' disease accompanying a retinal macrocyst and the lesions did not further progress and the retina was stabilized.