LSIV is seen (arrowhead) emptying into the PLSVC (arrow) (hemiazygous arch). * AA: aortic arch; AsAo: ascending aorta; DeAo: descending aorta; LP: left pulmonary artery; LSIV: left superior intercostal vein; MPA: main pulmonary artery; NSCLC: non small cell cancer; PLSVC: persistent left superior vena cava; RP: right pulmonary artery; (R)SVC: (right) superior vena cava.