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Immunophenotype of AITL: Microphotograph shows atypical lymphoid cells immunopositive for CD3 [A ×100] CD21 highlighting the expanded dendritic meshwork [B ×16] Loss of CD7 in the atypical lymphoid cells [C ×100] Characteristic immunophenotype of TFH atypical lymphoid cells PD1 [D ×100], Bcl6 [E ×100], ICOS [F ×100], CD10 [G ×100]. EBER ISH highlights the large atypical lymphoid cells [H ×100].
