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(A) Trans-oesophageal echocardiogram (TOE): Mid-oesophagus, 25° view demonstrating a secundum atrial septal defect (ASD) (crosses). P, posterior margin; AS, antero-superior margin; Ao, Aorta; LA, Left atrium; RA, Right atrium. (B) Trans-oesophageal echocardiogram (TOE): Mid-oesophagus, 90° view demonstrating a secundum ASD. PI, Posterio-inferior margin; PS, Posterio-superior margin; SVC, superior vena cava.
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