Pericardial Effusion Sizing Evaluation by Echocardiography. Representative (A) small, (B) moderate, and (C) large PEffs (∗). Representative (D) simple PEff with fibrin strands, (E) exudative PEff, and (F) malignant PEff (∗) caused by pericardial mesothelioma. Adapted with permission from Klein et al. Images and caption courtesy of the American College of Cardiology and JACC.