Inflammatory Myofibroblastic Tumor of the Right Atrium

Figure 4

(a) and (b) Histopathology of tumor showing proliferation of myofibroblasts, inflammatory cells, spindle, and fusiform cells in a myxoid stroma (hematoxylin & eosin, x100 & x400 magnifications). (c) Immunophenotype—Vimentin expression in myofibroblastic population (immunoperoxidase, x200). (d) Immunophenotype—Smooth muscle actin coexpression (immunoperoxidase, x200)