abnormal heart and great vessel attachment anomalous pulmonary venous connection 2010-09-28T03:01:06Z APVC MP:0010440 MPheno.ontology The word "anomalous" in this term and its children was used instead of abnormal since this is common usage among cardiologists. abnormal development and attachment of the four pulmonary veins that normally attach to the left atrium of the heart, resulting in either partial or complete anomalous drainage back into the systemic venous circulation via an anomalous connection to the right atrium, the superior or inferior vena cava, the innominate vein, the coronary sinus or the left subclavian artery anomalous pulmonary venous return csmith