Restrictive Superior Vena Cava to Left Atrium Communication With a Large Left-to-Right Shunt: A Previously Undescribed Sinus Venosus Defect Variant.
A 40-year-old woman was referred for cardiac assessment following a syncopal event. Echocardiography showed a dilated right ventricle and subsequent cross-sectional imaging suggested partial anomalous pulmonary venous connection (PAPVC) and a sinus venosus defect (SVD). She reported exertional dyspnoea, fatigue, paroxy...