congenital accessory mitral valve tissue
Findings
No curated finding names congenital accessory mitral valve tissue yet. Everything below is reference data from Mondo, HPO and GenCC, not evidence about what affects it.
Definition
Accessory mitral valve tissue is a congenital non-syndromic heart malformation defined as an accessory mitral valve leaflet or various accessory mitral valve structures. It may be asymptomatic or present at various ages with symptoms of left ventricular outflow tract obstruction, low cardiac output due to subaortic obstruction or congestive heart failure. In some cases, it may be a source of cardioembolism. The malformation may be isolated or associated with other congenital heart malformations.
Definition from the Mondo Disease Ontology (MONDO:0020402), read 2026-09-29. CC BY 4.0.