INTRODUCTION
Quadricuspid aortic valve (QAV) is a very rare congenital cardiac
abnormally, far less common than unicuspid or bicuspid aortic
valve.1 Aortic dilatation and other structural cardiac
abnormalities in patients with QAV are relatively common. Aortic valve
regurgitation is the main hemodynamic abnormality and the indication for
aortic valve surgery in the majority of patients who undergoing
surgery.2 Here, a 13-year-old patient with QAV who
presented to the outer center with a complaint of chest weight, who was
mistakenly diagnosed with insidious rheumatic carditis due to aortic
regurgitation, was presented, and and it was aimed to draw attention to
this rare congenital heart valve disease.