Anomalous Pulmonary Venous Draining means that the veins which bring blood back from the lungs to the heart are not connected to the correct part of the heart. There are four big veins that should bring blood back from the lungs to the left atrium (collecting chamber) of the heart. In some people one or more of these veins enter into the wrong part of the heart, for example they might be plugged into the right atrium which should collect blood from the body not the lungs. Anomalous drainage can be partial (some of the veins drain correctly) or in rare cases total (all of the veins drain into the wrong place. In the latter cases these children will present as babies and will often be very sick - this is because they cannot get enough Oxygen back from their lungs to the left side of their heart. Their lungs and heart are working fine but the Oxygenated (red) blood is going to the wrong place. Surgery is needed to correct this.