Fig. 5. Histological findings of renal allograft after graftectomy. (A) High cellular appearance in an invasive tumor nodule-like lesion (H&E, ×50). (B) Proliferation of spindle cells with a slit-like vascular space containing erythrocytes (H&E, ×400). (C) CD31 staining of spindled tumor cells (×400). (D) The spindle cells were positive for human herpesvirus 8 (immunohistochemistry human herpsevirus 8 stain, ×400).