Fig. 6From: Imaging features of skeletal muscle lymphoma: a case report and literature reviewHistopathological findings (a; hematoxylin–eosin [H&E] staining, 200 ×) showing medium sized tumor cells arranged in diffuse sheets, and immunohistochemical (IHC) staining (b–d; 100 ×) showing the Ki-67 proliferation index was 90% (b), and tumor cells were positive for CD20 (c) and negative for CD3 (d)Back to article page