Fig. 4
Histopathology of the tumor. a, b Desmoplastic fibroblastoma cells are stellate or spindle-shaped cells undergoing infrequent mitotic activity, embedded in an abundant collagenous stroma (a hematoxylin and eosin (H&E) staining, b elastica van Gieson staining). c Immunohistochemistry, demonstrating cells positively labeled for vimentin. d Examples of a capsule-like structure of fibrous tissue (*) and the abundant vascularity visible at the periphery of the tumor (arrowhead). (H&E staining)