Prominent Crista Terminalis on Echocardiogram (A4C) The ‘mass’ along the wall is likely the Crista Terminalis (superior border between rough and smooth RA wall). May be quite prominent like this. Ivan Stankovic, MD, PhD @Ivan_Echocardio #Crista #Terminalis #A4C #Echocardiogram #clinical #cardiology #pocus