Figure 2

Quadricuspid aortic valve. A: A short-axis image of the left ventricular outflow tract which was obtained by transthoracic echocardiography when the transducer was placed in the third right intercostal space. The mild aortic regurgitation can be seen by color Doppler when the transducer was placed in the third right intercostal space. B: A short-axis image of the left ventricular outflow tract which was obtained by transthoracic echocardiography when the transducer was placed in the fourth right intercostal space. A quadricuspid aortic valve (QAV) with one small cusp (1), two equal-sized cusps (2, 4), and one large (3) cusp (a class D QAV according to the classification of Hurwitz and Roberts [1] can be seen in the center of the echocardiogram.