An interatrial tunnel: a rare form of atrial septal defects

Atrial septal defects (ASDs) account for approximately 6%–10% of congenital heart defects. The well‐known types of atrial septal communications are the ostium secundum, ostium primum, sinus venosus types, and coronary sinus defects. A 50‐year‐old female was referred for TEE for better assessment of MR severity and mechanism. 2D/3D‐TEE showed a rare combination of different abnormalities; bi‐leaflet mitral valve prolapse, cleft P2, cor triatriatum sinister, and a tunnel‐shaped IAS communication. To the best of our knowledge, this is a very rare case with a rare form of atrial septal defect that was not described before. We named this defect an interatrial tunnel.

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