Torus aoicus is seen due to:
Torus aoicus (aoic mound) is the prominent region of the right atrial septum, which marks the projection of the noncoronary aoic sinus into the right atrial wall. The bulge is superior to the coronary sinus and anterior to the fossa ovalis. The right coronary aery arises from the anterior ('right coronary') aoic sinus; The left coronary aery arises from the left posterior (left coronary) aoic sinus.
Atrium bulging into the aoa
Aoic sinus bulging into left atrium
Aoic sinus bulging into right atrium
Aoic wall tear
Thorax: Aerial supply