An asymptomatic two-year-old boy was referred for the evaluation of a soft holosystolic murmur. The electrocardiogram was normal. Transthoracic two-dimensional echocardiography showed normal left ventricle dimensions and function. The number and location of the papillary muscles were normal. The mitral regurgitation originated through the cleft ( Fig. 1 video 1 ). Whereas the cleft was not well distinguished with two-dimensional echocardiography, three-dimensional echocardiography allowed distinct visualization of the cleft ( Fig. 2 video 2 ), which was clearly bisected in two equal parts.
A. Apical four-chamber view showing an eccentric mild mitral regurgitation jet. B. Regurgitation jet through the posterior leaflet of the mitral valve is seen on Doppler colour views.
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