(A) Transesophageal echocardiogram (TEE) 2-dimensional (2D) imaging of the interatrial septum with the atrial septal ridge shown by the yellow arrows. (B) 3D TEE rotated view of the interatrial septum with the fossa ovalis shown in plane with the ridge (yellow arrow). (C) Cardiac magnetic resonance cine SSFP 4-chamber image demonstrating the atrial septal ridge (yellow arrow). (D) The MitraClip transcatheter mitral valve delivery system safely traversed across the interatrial septum (red arrow) with the yellow arrow pointing towards the atrial septal ridge. RA: right atrium; LA: left atrium; AV: aortic valve; IAS: interatrial septum; FO: fossa ovalis; MV: mitral valve
The authors have no competing interests to declare.
Shizukuda Y, Muth J, Chaney C, Attari M. Anomalous ridge on the left atrial side of the atrial septum. Ann Card Anaesth. Apr-Jun 2012;15(2):161-2. doi: https://doi.org/10.4103/0971-9784.95083
Zisa D, Faletra FF, Wessler BS, et al. Ridges and Pouches: A Case Series of Anomalous Atrial Septal Fusion. CASE (Phila). 2020 Feb;4(1):7-17. doi: https://doi.org/10.1016/j.case.2019.10.009