Solitary fibrous tumors in abdomen and pelvis: Imaging characteristics and radiologic-pathologic correlation

Figure 4 Pathologic features of the solitary fibrous tumor. A: Hematoxylin and eosin staining, × 40, indicates monotonous spindle cell proliferation with a hemangiopericytoma-like vascular growth pattern; B-D: Immunohistochemical staining, x 40, indicates that the tumor is diffusely positive for CD34 (B) and Bcl-2 (C), and the proportion of Ki67 positive cells is 15% (D).