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.