Quadricuspid aortic valve and right ventricular type of myocardial bridging in an asymptomatic middle-aged woman: A case report

Figure 3 Classification of quadricuspid aortic valve. A: Hurwitz and Roberts[10] (a: Four equal-sized cusps; b: Three equal-sized larger cusps and one smaller cusp; c: Two equal-sized larger cusps and two equal-sized smaller cusps; d: One larger cusp, two equal mid-sized cusps and one smaller cusp; e: Three equal-sized smaller cusps and one larger cusp; f: Two equal-sized larger cusps and two unequal smaller cusps; g: Four unequal cusps); B: Vali et al[11] supplement to Hurwitz and Roberts quadricuspid aortic valve classification (Type h: One larger cusp, one mid-sized cusps and two equal-sized smaller cusp); C: Nakamura et al[12] (Type I: Supernumerary cusp between the left and right coronary cusps; Type II: Supernumerary cusp between the right and non-coronary cusps; Type III: Supernumerary cusp between the left and noncoronary cusps; Type IV: Unidentified supernumerary cusp as of two equal-sized smaller cusps; L: Left coronary cusp; N: Noncoronary cusp; R: Right coronary cusp; S: Supernumerary cusp).