congenital anomaly of superior vena cava persistent left superior vena cava connecting to the left-sided atrium https://www.malacards.org/card/persistent_left_superior_vena_cava_connecting_through_coronary_sinus_to_left_sided_atrium left superior caval vein persisting to the left-sided atrium MONDO:0020440 Orphanet:99109 persistent left superior caval vein connecting to the left-sided atrium UMLS:C5680293 Persistent left superior vena cava connecting to the left-sided atrium is a rare, congenital vascular malformation of the major vessels characterized by a persistent left superior vena cava which drains directly to the left atrium, without passing through the coronary sinus (that may be absent in some cases). Patients are usually asymptomatic and discovered incidentally, however hypoxia, cyanosis, murmurs, palpitations, cardiac structural anomalies (e.g. atrial septal defect, bicuspid aortic valve, cor triatrium) and risk of paradoxical embolization may be associated. MEDGEN:1830102 persistent left SVC connecting to the left-sided atrium GARD:0019652