Intraocular calcification can rarely occur in Coats' disease. To our best knowledge, all previously reported cases with intraocular calcification had significant exudative detachment. We report an 11-year-old boy with unilateral Coats' disease who had only moderate, widespread subretinal exudation with a ridge located temporal to left macula without overt exudative retinal detachment. Ultrasonographic evaluation and orbital computed tomography revealed that the ridge was calcified. It should always be remembered that calcification may be present even in patients with a moderate form of Coats' disease.