Figure 2: Photomicrographs showing (a) many large atypical cells in a fibrous background admixed with lymphocytes (H&E ×40), (b) Immunostaining showing strong positivity for CD 30 in large atypical cells (Immunoperoxidase, ×40) and (c). Immunostaining showing occasional CD 20 positivity in lymphoid cells but atypical large cells are negative for CD 20 (Immunoperoxidase, ×40)