Figure 4
From: ALK-positive diffuse large B-cell lymphoma: report of four cases and review of the literature
Unusual immunohistochemical findings in occasional cases of ALK-DLBCL. (a) Rare CD20-positive tumor cells. (b) Scattered and variable CD57 membrane positivity. (c) Occasional cytokeratin-positive cells (cases 1, 2, and 2, respectively).
