Midline crossing pulmonary vein: right upper lobe dual venous drainage, with partial anomalous venous return of the right lung into a persistent left superior vena cava

Introduction We present a case of dual drainage of the right upper lobe of the lung into the left atrium and via partial anomalous venous pulmonary return (PAPVR) into a persistent left superior vena cava (SVC). Discussion It is only in the minority of PAPVR cases where the anomalous pulmonary veins cross the midline. We provide a review of current literature on this topic and an explanatory embryological model. Knowledge of embryonic development and possible anatomic variations, including the concept of dual venous drainage of the lung, leads to better interpretation of imaging, with more accurate description of the morphology at hand. High-resolution multidetector computed tomography (MDCT) helps to delineate the exact vascular anatomy. This will enhance a better understanding of and anticipation on the patient's disease status, with more accurate planning of intervention, and possibly less complications.

Automated summary

By presenting a case of dual drainage of the right upper lobe of the lung and discussing anomalous pulmonary venous return, this study provides insights into the minority of cases where the anomalous pulmonary veins cross the midline. Understanding embryonic development and anatomical variations leads to better interpretation of imaging, accurate description of morphology, and more precise planning of interventions for patients with complex vascular anatomy.