Delayed presentation of partial anomalous systemic venous connection.

Anomalies of systemic venous connections are extremely rare. We describe the case of an asymptomatic 29-year-old woman who was found to have systemic desaturation in the peripartum period and referred to us for suspected cyanotic heart disease. She was diagnosed to have hemianomalous systemic venous connection of the inferior vena cava (IVC) into the left atrium (LA). Transesophageal echocardiogram with contrast diagnosed anomalous connection of the IVC to the LA, further confirmed by computed tomography and conventional angiography. The patient underwent successful surgical correction with an uneventful postoperative course.