Introduction: Quadricuspid aortic valve is a rare anatomical abnormality, its incidence ranging from 0.008% to 0.033%. Case Report: Wedescribe the case of a female patient with a quadricuspid aortic valve. The direct visualization showed a type E quadricuspid aortic valve. Aftercomplete excision of the valve, it was replaced by a 23mm biological prosthesis. Postoperative recovery was uneventful. Discussion: Since thefirst case, described in 1862, fewer than 200 cases have been diagnosed so far in world literature. Given its frequent association with othercardiac malformations, it is important that physicians seek their preoperative diagnosis.

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