ULTRASTRUCTURAL INVESTIGAT10N OF GIANT CELL TUMOR OF BONE

The surface and internal ultrastructure of multinuclear giant cells and stromal cells are studied in 3 cases of giant cell tumors of bone by means of scanning electronmicroscope and transmission electronmicroscope. The fibroblast- like type of stromal cells was the principal stro- mal cell and has the function of forming collagen. Like the fibroblastic type of stromal cells, the multinuclear giant cells can also be deemed as true tumor cells. Various surface ultrastruct- ural configurations of the multinuclear giant cells can be attributed more to heightened me- tabolism than to manifestation of malignancy.