[-Congenital hypoplasia of the anterior tricuspid leaflet as a cause of high-grade tricuspid valve insufficiency in a 64-year-old patient-].

In a 64-year-old man a heart murmur was present since childhood and could be identified 8 years ago as isolated tricuspid regurgitation. Because of progressive dyspnea there was an indication for surgical treatment. Intraoperatively, we found a hypoplastic anterior leaflet, though the other two leaflets were preserved in totally good condition, without any evidence of endocarditis. Tricuspid valve replacement was performed as there was no chance of reconstruction. To our knowledge, this is the first description of a congenital hypoplastic anterior leaflet of the tricuspid valve.