Intraoperative two-dimensional transesophageal echocardiography. Midesophageal (ME) long-axis (LAX) and commissural views with color Doppler showing severe regurgitation between the mid-part of anterior and posterior mitral leaflets (A2 and P2 scallops). The free margin of the AML tip appears intact in the ME LAX view. Central regurgitant flow arising from the mid scallop gap, A2 or P2, is noted in the ME commissural view. However, it was difficult to make a definite diagnosis regarding which part was responsible for the concurrent coaptation defect of the mitral valve producing mitral regurgitation using these views. LA: left atrium, LV: left ventricle, Ao: aorta, AML: anterior mitral leaflet, PML: posterior mitral leaflet. P1: anteriolateral scallop of PML, P2: middle scallop of PML, P3: posteromedial scallop of PML, and A2: middle part of AML (Video images are available on-line, video link 3 and 4).