Fig. 4
a Cellular lesion comprised of multinucleated giant cells containing numerous nuclei and monomorphic mononuclear cells. The stroma contains minimal if any collagen. b Hemosiderin deposits within stroma and histocytes. c Aggregate of foamy histiocytes. d Tumor necrosis with ghost of mononuclear tumor cells admixed with fibrin and histiocytes. e p63 immunohistochemistry highlighted the nuclei of the mononuclear cells which supports the diagnosis of giant cell tumor