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Aortic valve morphologies. Unicommissural unicuspid valve with an eccentric loophole-shaped orifice (A, systole; E, diastole); bicuspid valve without raphe having two cusps and commissures (B, systole; F, diastole); bicuspid valve with raphe containing two cusps and commissures (C, systole; G, diastole); quadricuspid valve with incomplete leaflet coaptation due to insufficiency (D, systole; H, diastole).
