Adenomatoid odontogenic tumor (AOT) of maxillary sinus: case report with respect to immunohistochemical findings.

This report describes the surgical therapy, clinical course and morphological characteristics of an adenomatoid odontogenic tumor that developed in the maxilla of a 16-year-old patient. The cystic tumor filled the maxillary sinus and was removed with the retained tooth. Healing was uneventful and no local recurrence was observed during a two-year period of follow-up control. The tumor showed immunoreactivity for certain types of cytokeratins, vimentin and p63, and was focally immunoreactive for alpha smooth muscle actin and epithelial membrane antigen.