congenital mitral valve insufficiency and/or stenosis congenital unguarded mitral orifice https://github.com/monarch-initiative/mondo/issues/4069 https://www.malacards.org/card/congenital_unguarded_mitral_orifice MONDO:0020401 UMLS:C0344769 MEDGEN:576490 Orphanet:99060 GARD:0019627 icd11.foundation:1824064279 Congenital unguarded mitral orifice is a rare, congenital, mitral valve malformation characterized by complete absence of mitral valve leaflets and tensor apparatus at the mitral annulus, which can present clinically with cyanosis, heart murmur, electrocardiogram abnormalities, mild cardiomegaly, or congestive heart failure. Association with heterotaxy, discordant atrioventricular connections, double-outlet right ventricle, pulmonary atresia or stenosis, thin left ventricular wall, and hypoplastic left heart syndrome has been reported.