Figure 1. TTE showed left atrium with a linear, mobile, membrane-like structure (arrow) across left atrial appendage (asterisk) (A, B). TEE demonstrated a linear, mobile, membrane-like structure traversing the body of left atrial appendage without a turbulent Doppler color flow across the membrane with Color Doppler (C, D). (LA, left atrium; LV, left ventricle; LAA, left atrial appendage).