Lipomatous hypertrophy of the interatrial septum on Echocardiogram (s4c) It typically spares the fossa ovalis giving a characteristic hourglass-shaped appearance. by Dr. Milica Stefanovic @MilicicaStefano via Ivan Stankovic, MD, PhD @Ivan_Echocardio #Lipomatous #hypertrophy #interatrial #septum #Echocardiogram #s4c #clinical #cardiology #pocus