Incidentally Detected Persistent Left Superior Vena Cava With an Absent Right Superior Vena Cava in a Neonate

A 3-week-old female underwent transthoracic echocardiography (iE33, Philips medical system, Andover, MA, USA) to evaluate a grade 1 systolic murmur. In the subcostal view, blood flow in the inferior vena cava drained to the right atrium, while no blood flow from the superior vena cava to the right atrium was noted (Figure 1A). In the four-chamber view, no superior vena caval blood flow was seen, but an enlarged coronary sinus drained to the right atrium. Except for a patent foramen ovale, there were no congenital heart defects. In the parasternal long-axis view, a dilated coronary sinus was noted posterior to the left atrium (Figure 1B) and the suprasternal view showed a persistent left superior vena cava with a right innominate vein draining toward the left superior vena cava and an absent right superior vena cava (Figure 1C). The baby girl was diagnosed with a persistent left superior vena cava with an absent right superior vena cava. Since there was no obvious problem with venous blood draining to the right atrium, her parents were reassured. Six months later, thoracic CT (somatome definition flash, Siemens healthcare, Forchheim, Germany) angiogram was performed to confirm the diagnosis and find any unrevealed anomalies. CT confirmed absence of the right superior vena cava and the right jugular and subclavian veins drained to the left superior vena cava through the innominate vein (Figure 2). The left superior vena cava drained to the right atrium through the dilated coronary sinus with no stenosis. The baby girl did not undergo any medical or surgical procedure to correct this anomaly and she is healthy during 2 years of follow up period.