A newborn baby was transferred to our hospital because of a pulsating mass of the abdominal wall just above the umbilical insertion. The patient was comfortable, not cyanotic and breathing spontaneously, but with mild tachypnoea. Physical examination was unremarkable except for a pulsating purple mass in the midline just above the umbilicus (middle panel). The chest x ray showed a moderate dextroposition of the heart without any pulmonary pathology. The ECG was normal. Echocardiography revealed a normal intracardiac anatomy except for a long and narrow appendiform diverticulum at the apex of the left ventricle of almost 3 cm, contracting …