Umbilical catheter masquerading at echocardiography as a left atrial mass

The case of a newborn who had an umbilical catheter inserted in the intensive care unit is discussed. This catheter was meant to be inserted into the umbilical artery, but was instead inadvertently inserted into the umbilical vein. It crossed a patent foramen ovale into the left atrium. This fact was not known at the time of echocardiographic evaluation. At echocardiography, abnormal echoes within the left atrium were seen. Findings were typical for a catheter within the heart, and the umbilical catheter was subsequently withdrawn. There is a potential for mistaking the echocardiographic findings for a left atrial abnormality and echocardiographers should be alert to this possibility.