Immunohistochemical findings of the tumor. a and b. Myoepithelium rimming papillary-cystic structure of the tumor is positive for p63 (a) and cytokeratin 14 (b). Original magnification ×200. c. The tumor cells exhibit strong positivity for S-100. ×200. d. Carcinoembryonic antigen is positive in the lumen of cystic spaces and tubules. ×200. e. and f. The tumor cells did not exhibit positivity for neither CD34 (e) nor synaptophysin (f). ×200. g. CD56-positive cells were scattered. ×200. h. The Ki-67 labeling index was approximately 5%. ×200.