Fig. 2: Pathological diagnosis of primary cardiac malignant fibrous histiocytoma (MFH).

Light microscopy (hematoxylin–eosin, HE) presenting the morphology of tumor cells. Immunohistochemical staining positive for Vim (vimentin), CK (cytokeratin), and WT-1 (Wilms' tumor gene 1) and negative for MyoD-1 (myogenic differentiation antigen 1), CD31 (platelet endothelial cell adhesion molecule-1, PECAM-1/CD31), Desmin, S100 (calcium-binding protein), SMA (smooth muscle actin), MSA (muscle-specific Actin), EMA (epithelial membrane antigen), Myogenin, CK5/6 (cytokeratin 5/6), CD34 (hematopoietic progenitor cell antigen CD34), HBME-1 (human mesothelial cell), and PGM-1 (phosphoglucomtase-1). Representative images of the antibody staining are displayed. Scale bars, 100 µm