Abnormal connexion of the coronary sinus to the left atrium

Cor Triatriatum Dexter Associated with an Ostium Primum Atrial Defect and Left-Sided Opening of the Coronary Sinus in a Stillborn Fetus

“…Coronary sinus anomalies are infrequent and include its absence [18,19], enlargement or hypoplasia [20], unroofed coronary sinus [20][21][22] and its abnormal drainage to the left atrium [23][24][25][26], as we observed in the present case. The opening of the coronary sinus into the left atrium can manifest by a varicose dilation of the cardiac veins due to increased left atrial pressure propagating to the cardiac venous network [24]. Venous drainage of the right ventricle is into the anterior wall of the right atrium in the form of prominent anterior cardiac veins, which is an infrequent finding in the autopsy and can less frequently be clinically diagnosed by a CT scan [27].…”

“…Detailed knowledge of its anatomy is of particular interest in patients undergoing various cardiac interventions [ 17 ]. Coronary sinus anomalies are infrequent and include its absence [ 18 , 19 ], enlargement or hypoplasia [ 20 ], unroofed coronary sinus [ 20 , 21 , 22 ] and its abnormal drainage to the left atrium [ 23 , 24 , 25 , 26 ], as we observed in the present case. The opening of the coronary sinus into the left atrium can manifest by a varicose dilation of the cardiac veins due to increased left atrial pressure propagating to the cardiac venous network [ 24 ].…”