Primary ovarian angiosarcoma: Two case reports and review of literature

Figure 4 Pathological findings of case 2. A: Tumor cells showed positive immunohistochemical reaction for CD31 (× 10); B: Residual leucosome ovarian tissue can be seen around the tumor tissue (hematoxylin and eosin, × 10); C: Immunohistochemical staining showed tumor cells strongly expressed programmed death ligand 1 (average with 50%, hotpot with 99%) (× 10).