Primary osteosarcoma of the heart.
D004452:Echocardiography; D006325:Heart Atria / Q000473:pathology; D006338:Heart Neoplasms / Q000175:diagnosis / Q000473:pathology*; D006346:Heart Septum / Q000473:pathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D012516:Osteosarcoma / Q000175:diagnosis / Q000473:pathology*