Congenital cardiac diverticuli are infrequent. More so, if one is specially restrictive with the criteria. Usually, they are not isolated but a part of a malformation syndrome that affects the medium thoraco-abdominal line and have an embryological explanation. We present a case of congenital cardiac diverticulum originating from both ventricles with a thoraco-abdominal malformation. We describe the clinical findings, the nuclear magnetic resonance, the echocardiography and cardiac catheterization. We comment the anatomy, the total diagnosis, therapy and complications.