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Figure 4 Dissection flap prolapse can be visualized by mutiplane TEE in the short-axis and long-axis views at 45° and 120°, respectively. The top panel is a short-axis view of the aortic valve at the onset of diastole. The arrows point to the three aortic leaflets; a dissection flap is seen prolapsing through the center of the aortic leaflets. The bottom panel is a long-axis view of the aorta showing the dissection flap prolapsing through the plane of the aortic valve.