Malignant giant cell tumors of the tendon sheath of the right hip: A case report

Figure 5 Histopathological images. A: Hematoxylin-eosin (HE) staining showed that the tumor was composed of mononuclear synovial-like cells and sarcoma cells. Lacunar-like lacunae were shown within the tumor cells and pleomorphism and heterogeneity of the tumor cells were obvious. Pathological nuclear division was seen and a collagen matrix was found between the cells (magnification ×100); B: Immunohistochemical staining revealed CD31 positivity (Envision, 100×); C: Immunohistochemical staining revealed CD34 positivity (Envision, 100×); D: Immunohistochemical staining revealed CD99 positivity (Envision, 100×); E: Immunohistochemical staining revealed Vimentin positivity (Envision, 100×); F: Immunohistochemical staining revealed INI-1 positivity (Envision, 100×); G: Immunohistochemical staining revealed TLE1 positivity (Envision, 100×); H: Immunohistochemical staining revealed CK positivity (Envision, 100×).