Immunistaining was done with appropriate positive and negative controls and revealed:
CD20: diffuse positive reaction in tumor cells.
CD3: negative in tumor cells, stained background reactive T cells.
Ki-67 labeling index about 70%.
Referred paraffin blocks for immunistaining of Rt. inguinal lymph nodes excision biopsy, previously submitted (pathology number 2301-2026) and diagnosed as atypical lymphoid infiltrate consistent with large cell NHL) on 11 April 2026.
Two referred paraffin blocks and two Hx&E stained slides coded 2103-2026.
Rt. Inguinal lymph node, excision biopsy and immunostaining: