A rare congenital heart valve condition called a quadricuspid valve occurs when a person is born with four cusps on the aortic valve instead of the usual three.
Notes on verification
Confirmed by multiple independent medical sources including AHA/Circulation and peer-reviewed case reports in PMC, consistently describing quadricuspid aortic valve as a rare congenital defect with four cusps instead of three. [tier=silver indep_score=0.925 clusters=2 claim_tier=notable]
Sources
- Bicuspid aortic valve - Overview - Mayo Clinic (seed:health_and_medicine)
- https://www.ahajournals.org/doi/10.1161/CIRCULATIONAHA.115.017743 (corroboration)
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6481097/ (corroboration)
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10290899/ (corroboration)