CD99 and neoplasm: Immunohistochemical staining provided the following results: the tumor cells exhibited multifocal membranous positivity for CD99 (Figure 3A), diffuse positivity for WT1 (Figure 3B), TLE1 (Figure 3C), FLI-1, INI-1, vimentin, and p53, and focal positivity for calretinin and CD56.