Figure 4
From: ALK rearrangement and overexpression in epithelioid fibrous histiocytoma
Atypical fibrous histiocytoma showing entrapment of collagen and scattered large atypical cells (a). Tumor cells are negative for ALK expression (inset). Aneurysmal fibrous histiocytoma with hemosiderin deposition (b) is also negative for ALK expression (inset).
