Immunohistochemistry of the punch biopsy from the left neck. The atypical cells are positive for CD30, CD79a and CD20. CD15 and PAX5 show positive and dim staining in the tumor cells. CD3 and CD68 (not shown) stain a background of small T-cells and abundant histiocytes, respectively. The large cells are negative for CD45, EBER and Melan-A (not shown).
Gru and Lu Diagnostic Pathology 2013 8:135 doi:10.1186/1746-1596-8-135