Fig. 3

a The nodule was firm and solid. On sectioning, it appeared well-demarcated and was yellow-white in color. b. The histopathological findings revealed a well-demarcated nodular lesion was composed of a proliferation of spindle or oval cells, admixed with some pleomorphic cells, arranged in a fascicular fashion with ropey collagen fibers, associated with variably dilated blood vessels often displaying staghorn-like appearance, involving the pleural tissue and the pulmonary alveolar tissue. Mitotic figures were few (×200). c. Immunohistochemically, the tumor cells were positive for CD34 (×200). d. Immunohistochemically, the tumor cells were positive for bcl-2 (×200). e. Immunohistochemically, the tumor cells were positive for STAT6 (×200). f. Immunohistochemically, the tumor cells were negative for alpha-SMA (×200). g. Immunohistochemically, the tumor cells were positive for desmin (×200). h. Immunohistochemically, the tumor cells were positive for S-100 (×200).