biostudies-literatureUnknown28Mannina CSinus venosus atrial septal defect (SVASD) with partial anomalous pulmonary venous return is a rare congenital heart defect that may present in adulthood when right heart enlargement has already occurred. We describe a case of unrepaired sinus venosus atrial septal defect and partial anomalous pulmonary venous return with massive right heart enlargement and recurrent atrial arrhythmias.JACC. Case reports102091https://www.ebi.ac.uk/biostudies/studies/S-EPMC10774777biostudies-literatureMassive Right Ventricle Enlargement in Unrepaired Sinus Venosus Atrial Septal Defect: Repair or Not?PMC10774777Zaidi ANLove BHopkins KMannina CfalseMassive Right Ventricle Enlargement in Unrepaired Sinus Venosus Atrial Septal Defect: Repair or Not?Sinus venosus atrial septal defect (SVASD) with partial anomalous pulmonary venous return is a rare congenital heart defect that may present in adulthood when right heart enlargement has already occurred. We describe a case of unrepaired sinus venosus atrial septal defect and partial anomalous pulmonary venous return with massive right heart enlargement and recurrent atrial arrhythmias.2023-01-01T00:00:00Z2023 Dec2025-04-04T13:58:58.526Z2025-04-04T13:58:58.526ZS-EPMC107747773820453110.1016/j.jaccas.2023.102091