CONCLUSIONS
The RAV is a highly variable structure. It was found to have a 3-leaflet configuration in 67.0% of hearts and a 4-leaflet configuration in 33.0% of cases. The supero-septal part of the RAV is the least variable component, whereas the infero-mural is the most variable. Four-leaflet valves have significantly larger perimeters. Septal and mural leaflets are both significantly shorter and higher in 4-leaflet RAVs than in 3-leaflet configurations. When present, the inferior leaflet has a similar size to the mural leaflet. In 3-leaflet valves, the muro-septal commissure has a dominating character that is not observed in 4-leaflet configuration. The number of RAV leaflets significantly influences the relative position of individual valve components in relation to right atrial structures.