Fig. 2
a The tumor cells showed features of squamous cell carcinoma, which were composed of abundant pink cytoplasm, moderate atypia, and focal keratinization (magnification, × 100). b The poorly differentiated adenocarcinoma components were consisted of solid nests of poorly differentiated tumor cells with ovoid nuclei and prominent nucleoli (magnification, × 100). c The sarcoma component consisted mainly of osteosarcoma, characterized by neoplastic bone and severe cellular anaplasia (magnification, × 100). d In pleomorphic adenoma component, the tubular and acinar structures formed by epithelial cells were compressed by abundant hyalinized eosinophilic matrix (magnification, × 100)