MYOG and neoplasm: Immunohistochemical staining demonstrated positive expression of Desmin, Myogenic Differentiation 1 (MyoD1), and Myogenin in the tumor cells (Figure 2), with a Ki-67 proliferation index of 70%, while were negative for CD20, cytokeratin (CK), CD79a, CD38, and chromogranin A (CgA).