case_images: PMC5971376_01
case_images: Echocardiography showing an isoechoic to hyperechoic mass (arrow) emerged
  from the IVC to the RA, passing through the tricuspid valve into the RV in
  diastole. RA: right atrium; RV: right ventricle; IVC: inferior vena
  cava.
case_images: 10.1177_2058738418778121-fig1.jpg
case_images: PMC5971376_01_10.1177_2058738418778121-fig1.jpg
case_images: fig1-2058738418778121
case_images: During a follow-up visit, his echocardiography showed an isoechoic to hyperechoic mass in the RA (Figure 1).
case_images: Light microscopic examination showing platelet-rich thrombus, scattered with
  lymphocytes, neutrophils, and eosinophils, without tumor components.
case_images: 10.1177_2058738418778121-fig2.jpg
case_images: PMC5971376_01_10.1177_2058738418778121-fig2.jpg
case_images: fig2-2058738418778121
case_images: With regard to the pathological findings, light microscopic examination showed a platelet-rich thrombus, scattered with lymphocytes, neutrophils, and eosinophils, without tumor components (Figure 2).