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Additional file 2: Video 2. Transthoracic echocardiography in parasternal long axis view showing left atrium divided into 3 chambers by 2 membranes, uninterrupted blood flow from proximal LA chamber to mitral valve, dilated right atrium and right ventricle, presence of tricuspid regurgitation, ASD between middle LA chamber and RA, mild MR with accessory mitral valve tissue over posterior mitral leaflet.
