Fig. 1. S-100 immunoreactivity of tumor cells (original magnification×200).
Fig. 2. HMB-45 immunoreactivity of tumor cells (original magnification×400).
Fig. 3. High-power view of the tumor revealed that it was composed of pleomorphic cells. The large nuclei were markedly hyperchromatic, and contained prominent nucleoli (HE, original magnification×400).