Fig. 1

Histopathological analyses of solitary fibrous tumor tissue. A Immunohistochemical staining of CD34, typical positive staining on solitary fibrous tumor. B Hemalaun-eosin staining of core biopsy tumor tissue from pulmonary metastasis of primary fibrous tumor. C Immunohistochemical staining for STAT6 on solitary fibrous tumor (positive nuclear staining, low magnification). D Immunohistochemical staining for STAT6 on solitary fibrous tumor (positive nuclear staining, high magnification)