What is the Moderator band?
The moderator band is a prominent muscular ridge in the RV, present in up to 92% of patients.
The origin is along the septal band of the crista supraventricularis (the parietal band being the other origin), which together are called the septomarginal trabeculation.
Moderator band is an important anatomic landmark that is used to characterize the morphologic RV in congenital heart diseases.
It provides support to the anterolateral papillary muscle, guides blood from the RV inflow tract to the outflow tract, and prevents RV overdistention, especially in cases of RV infarction.
Reference)
RadioGraphics 2019 39:5, 1238-1263
