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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.
Biomarker and diagnostic research for congenital accessory mitral valve tissue has been reported in the published literature.
No clinical trials have been registered for congenital accessory mitral valve tissue.
10 publications have been identified in PubMed for congenital accessory mitral valve tissue. Research spans Case Report / Case Series (78%), Diagnostic / Biomarker (11%), and Review / Meta-Analysis (11%).
Akgün G (2026). [PMID: 41793466](https://pubmed.ncbi.nlm.nih.gov/41793466/). *Pediatric cardiology*. [Case Report / Case Series]
De Cuyper L (2026). [PMID: 41407602](https://pubmed.ncbi.nlm.nih.gov/41407602/). *Journal of cardiothoracic and vascular anesthesia*. [Case Report / Case Series]
Kurogi K (2026). [PMID: 41342819](https://pubmed.ncbi.nlm.nih.gov/41342819/). *JACC. Case reports*. [Case Report / Case Series]
Sabri MS (2026). [PMID: 41329103](https://pubmed.ncbi.nlm.nih.gov/41329103/). *JACC. Case reports*. [Case Report / Case Series]
Türkmen İ (2025). [PMID: 40152725](https://pubmed.ncbi.nlm.nih.gov/40152725/). *Turk Kardiyoloji Dernegi arsivi : Turk Kardiyoloji Derneginin yayin organidir*. [Case Report / Case Series]
Data assembled from 3 of 12 sources · Last updated Sep 19, 2026, 4:30 PM UTC
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about congenital accessory mitral valve tissue
Xu J (2025). [PMID: 40511724](https://pubmed.ncbi.nlm.nih.gov/40511724/). *The Journal of international medical research*. [Review / Meta-Analysis]
Ghenghea R (2025). [PMID: 39523790](https://pubmed.ncbi.nlm.nih.gov/39523790/). *European heart journal. Cardiovascular Imaging*. [Diagnostic / Biomarker]
Al-Maskari SN (2025). [PMID: 41948543](https://pubmed.ncbi.nlm.nih.gov/41948543/). *Annals of pediatric cardiology*. [Case Report / Case Series]
Wang Z (2024). [PMID: 39649505](https://pubmed.ncbi.nlm.nih.gov/39649505/). *Clinical case reports*. [Case Report / Case Series]