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Free-floating left atrial ball thrombus is an extremely rare and serious disorder that usually occurs in the setting of a large, dilated left atrium with stagnant flow, commonly the result of severe rheumatic mitral stenosis and accompanying atrial fibrillation. In the present case, we report a free-floating left atrial ball thrombus developed in an 11-year-old child with idiopathic restrictive cardiomyopathy...