A shows echocardiographic acquisition planes, of right parasternal long axis and short axis views through the aortic valve (AoV). B depicts the visualisation plane used to reconstruct the three-dimensional images below (adapted from Sisson, 1914 ). C and D are reconstructed bronze-purple rendered three-dimensional echocardiographic images, which are digitally ‘dissected’ from the original image and were acquired using a 2.5MHz 3V phased-array transducer attached to Vivid 7 Dimension (GE Ultrasound, Bedford, UK) showing the appearance of the non-coronary cusp (NCC) of a normal AoV (C) and of a prolapsing NCC (D). The NCC is viewed from within the looking up. The white arrow on each diagram points towards NCC of the AoV, the red line joins the two coaptation points of the non-coronary cusp and the yellow line depicts prolapse of the cusp.