TEE midesophageal two-dimensional bicaval (115°) view showing regression of the hyperechoic mass (white double arrow) after 5 days of therapeutic anticoagulation and before VA ECMO withdrawal. The mass is still trapped within the Chiari network albeit reduced in size and measuring 2.8 cm. LA, Left atrium; IVC, inferior vena cava; RA, right atrium; SVC, superior vena cava.