An unusual type of partial anomalous pulmonary venous return with all pulmonary veins draining to left atrium (!)

Multiple thromboembolic events associated with bilateral superior vena cava and anomalous drainage into the left atrium

A 49-year-old female patient presented with acute-on-chronic chest pain. She was diagnosed with multiple systemic thromboemboli, including myocardial infarctions, bilateral chronic pulmonary emboli, ischaemic stroke, deep venous thrombosis and superficial thrombophlebitis. She had a background of sickle cell trait. Cardiac magnetic resonance showed bilateral superior vena cava (SVC). The right-sided SVC (RSVC) was joined by the right upper pulmonary vein and drained anomalously into the left atrium. This caused a small volume right to left shunt. The persistent left SVC drained into the right atrium (RA) via a dilated coronary sinus. The overall clinical impression was recurrent paradoxical emboli due to anomalous venous anatomy with a thrombophilia secondary to sickle cell trait. In the normal embryo, the right common cardinal vein develops to become the RSVC, which drains into the RA by term.

Partial anomalous pulmonary venous return with dual drainage to the superior vena cava and left atrium with pulmonary hypertension

Partial anomalous pulmonary venous return (PAPVR) is a rare congenital cardiovascular anomaly. A 68-year-old woman was referred to our hospital for detailed examination for pulmonary hypertension (PH). She had been diagnosed as having pulmonary artery dilation and suspected to have PH during a health check seven years prior. A contrast computed tomography showed that the right upper pulmonary vein (RUPV) returned to the superior vena cava (SVC) with a preserved normal connection to the left atrium (LA). Surgical repair was performed. We reported an extremely rare case of isolated PAPVR with PH showing dual drainage into the SVC and LA.