Cardiac involvement of metastatic osteosarcoma is exceedingly rare and carries a dismal prognosis. Documentation of the surgical management of cardiac metastatic osteosarcoma is limited. We describe the successful resection of a ∼ 3.9 x 2.2 cm mass involving the right atrioventricular groove and right ventricular inferolateral wall, granting our patient 12 months of excellent cardiac function in the face of advanced metastatic disease.