Figure 2.

Two-sinus bicuspid aortic valve. Figure represents two cusps’ non-fusion patterns seen in the short heart axis. Aortic valves have two sinuses with two leaflets non-derived from fusion mechanisms. (1) Coronary arteries originate from the two sinuses with two lateral leaflets. The opened valve in systole phase has the oval-ball image. (2a) In this position, coronary arteries originate from the anterior sinus (right coronary artery) and posterior sinus (common left stem). (2b) Right coronary artery and common left stem both originate from anterior sinus. Abbreviations; A, anterior; L, lateral P, posterior.