A 2-year-old male child presented with fever, complete heart block, an
d congestive cardiac failure. Echocardiography showed a dumbbell-shape
d mass in the right ventricle and right atrium. He was operated on wit
h a provisional diagnosis of rhabdomyoma. Histopathology and immunohis
tochemistry of the resected tumor revealed a malignant germ cell tumor
with predominant yolk sac differentiation.