Figure 1.

Representative histologic section of undifferentiated pleomorphic sarcoma with giant cells obtained from the anterior right ankle mass. (A) Osteoclastic-like multinucleated cells mixed with pleomorphic and predominantly atypical round cell population (H–E, ×100), (B) Multinucleated giant cells admixed with tumor pleomorphic cells with atypical mitosis (H–E, ×100), (C) Hemorrhagic areas (H–E, ×100), and (D) Osteoclastic giant cells with irregular nuclei and prominent nucleoli. The pleomorphic cells have much longer nuclei (H–E, ×200).