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Figure 5: (a) Pan-dermal diffuse T-cell infiltrate (H and E, ×20); (b) mixture of small and medium, nonepidermotropic lymphocytes in small-medium pleomorphic CD4+ T-cell lymphoma (H and E, ×200); (c) large atypical cells with prominent nucleoli in anaplastic large cell lymphoma (H and E, ×400); (d) strong expression amongst small and medium T-cells in small-medium pleomorphic CD4+ T-cell lymphoma (CD4 IHC, ×20); (e) positivity restricted to admixed reactive B-cells in small-medium pleomorphic CD4+ T-cell lymphoma (CD20 IHC, ×20); (f) strong expression by sheets of large cells in anaplastic large cell lymphoma (CD30 IHC, ×400); (g) strong immunoreactivity by large cells in extracutaneous anaplastic large cell lymphoma (ALK-1 IHC, ×400)

Figure 5: (a) Pan-dermal diffuse T-cell infiltrate (H and E, ×20); (b) mixture of small and medium, nonepidermotropic lymphocytes in small-medium pleomorphic CD4+ T-cell lymphoma (H and E, ×200); (c) large atypical cells with prominent nucleoli in anaplastic large cell lymphoma (H and E, ×400); (d) strong expression amongst small and medium T-cells in small-medium pleomorphic CD4+ T-cell lymphoma (CD4 IHC, ×20); (e) positivity restricted to admixed reactive B-cells in small-medium pleomorphic CD4+ T-cell lymphoma (CD20 IHC, ×20); (f) strong expression by sheets of large cells in anaplastic large cell lymphoma (CD30 IHC, ×400); (g) strong immunoreactivity by large cells in extracutaneous anaplastic large cell lymphoma (ALK-1 IHC, ×400)