Quadricuspid semilunar valve.
D000293:Adolescent; D000328:Adult; D001021:Aortic Valve / Q000002:abnormalities* / Q000473:pathology; D001022:Aortic Valve Insufficiency / Q000209:etiology; D001344:Autopsy; D002648:Child; D004696:Endocarditis / Q000150:complications; D005260:Female; D006330:Heart Defects, Congenital / Q000150:complications / Q000196:embryology / Q000473:pathology; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D008875:Middle Aged; D011664:Pulmonary Valve / Q000002:abnormalities* / Q000473:pathology; D011666:Pulmonary Valve Stenosis / Q000209:etiology