Primary cardiac tumors are rare, and myxomas represent the most common type. Myxoma in a child is very rare. Herein, we present the case of a 4-year-old boy who was diagnosed with a right atrial mass two months after open-heart surgery for removal of a supra-mitral ring and repair of an interatrial septum aneurysm. He underwent surgery for resection of the mass, and pathological studies showed it was a cardiac myxoma. After 45 months of follow-up, the patient was alive without any recurrence or problems. This is the most rapidly growing myxoma ever reported in a child.
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