giant cell tumor , malignant fibrous histiocytoma and nonossifying fibroma showed enzyme histochemistry similar to each other : multinucleated giant cells and round cells in these tumors were strongly positive for acpase , nse , atpase and 5'-nucl simulating osteoclasts and histiocytes , whereas spindle cells were positive for atpase and 5'-nucl in their cytoplasm and weakly positive for acpase .
C0017525
giant cell
C0017526
multinucleated giant cells