Anomalous left inferior pulmonary vein crossing midline and draining via common ostium with right inferior pulmonary vein.
Sarwar A, Nasir K, Shapiro MD, Abbara S. Anomalous left inferior pulmonary vein crossing midline and draining via common ostium with right inferior pulmonary vein. J Cardiovasc Electrophysiol. 2008 Feb; 19(2):223.