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Figure 2: The views of atrial septum (AS) from the right atrium are shown with 3-dimensional transesophageal echocardiography. The AS is viewed from the right atrial free wall in panel (a) The oval fossa (OF) is demonstrated as slight depression of the atrial septum. The atrial septum is viewed in standard bicaval view in panel. (b) SVC denotes superior vena cava. The ridge formation is depicted by a white arrow head

Figure 2: The views of atrial septum (AS) from the right atrium are shown with 3-dimensional transesophageal echocardiography. The AS is viewed from the right atrial free wall in panel (a) The oval fossa (OF) is demonstrated as slight depression of the atrial septum. The atrial septum is viewed in standard bicaval view in panel. (b) SVC denotes superior vena cava. The ridge formation is depicted by a white arrow head