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Figure 1: Thrombus (black arrows) is seen at the flutter isthmus as (a) fine endocardial granularity; (b) plaque of flaky friable yellowish-white material and (c) large reddish-brown mass. In the last panel, there is a cylindrical tract of thrombus (white arrow) in relation to the opening of superior vena cava. ATL: Anterior tricuspid leaflet, FO: Fossa ovalis, PTL: Posterior tricuspid leaflet, RA: Right atrium, RV: Right ventricle, STL: Septal tricuspid leaflet, TV: Tricuspid valve, SVC: Superior vena cava

Figure 1: Thrombus (black arrows) is seen at the flutter isthmus as (a) fine endocardial granularity; (b) plaque of flaky friable yellowish-white material and (c) large reddish-brown mass. In the last panel, there is a cylindrical tract of thrombus (white arrow) in relation to the opening of superior vena cava. ATL: Anterior tricuspid leaflet, FO: Fossa ovalis, PTL: Posterior tricuspid leaflet, RA: Right atrium, RV: Right ventricle, STL: Septal tricuspid leaflet, TV: Tricuspid valve, SVC: Superior vena cava