Fig. 3. Representative images of immunohistochemical staining of T/NK-cell lymphomas. In ALK-positive anaplastic large cell lymphoma, tumor cells are negative for CD3, and positive for CD30 and ALK. In angioimmunoblastic T-cell lymphoma, CD3 and CD20 shows mixed pattern of T- and B-cells. CD21 stain shows expanded follicular dendritic cell meshwork. EBV ISH is positive in scattered large B-cells. In extranodal NK/T-cell lymphoma, EBV positive cells are positive for CD3 and negative for CD79a in double stains.
Abbreviations: AITL, angioimmuno-blastic T-cell lymphoma; ALCL, ana-plastic large cell lymphoma; ENKTL, extranodal NK/T-cell lymphoma.

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