DLBCL-NOS (case 45). (A) Diffuse lymphoid proliferation of medium to large cells that dissects the skeletal muscle of chest wall. (B) Mitotic figures were readily seen. The tumor cells are positive for CD79a focal (C), PAX5 strong (D), MUM1 (E), LMP1 (F), and EBNA2 (G). This was 1 of 3 cases that expressed a latency III phenotype. Original magnifications: ×200 (A) and ×400 (B-G).