Figure 2
From: Three-dimensional transesophageal echocardiography of the atrial septal defects
A.- 3D TEE reconstruction illustrating an OS ASD as seen from a right-superior view with removed right atrial free wall. (1). We can observe the orifice of the coronary sinus (2) close to the tricuspid ring (3) forming part of the "Koch triangle". The linear structure between both orifices corresponds to a prominent Eustachian valve (4a).
B.- An anatomic specimen that closely resembles the reconstructed 3D image. Note that in this case instead of a prominent Eustachian valve, a Chiari network (4b) is observed.