Figure 2

(A) Histology and immunoprofile of spindle cell oncocytoma. Spindle cell neoplasm with interlacing fascicles of spindled to epithelioid cells with eosinophilic and oncocytic cytoplasm (original magnification, ×400; hematoxylin and eosin stain). (B) Immunohistochemical study showed that most tumor cells coexpressed S-100 protein (original magnification, ×400; hematoxylin and eosin stain) and (C) vimentin and epithelial membrane antigen (original magnification, ×400; hematoxylin and eosin stain). (D) Tumor cells were negative with pituitary hormones.