Abstract
A case of adenoid cystic carcinoma which appeared in the floor of the mouth, is presented.
A 75-year-old man visited to our hospital with a chief complaint of a painless tumor in the floor of the mouth. The patient was treated with surgical resection and received a course of postoperative radiation therapy (39 Gray).
Microscopically, the resected material consisted mainly of typical cribriform structure. Electron microscopic observation revealed that the tumor cells were able to divided into the following two cell types; light cell (secretory-like cell) contained a small amount of secretory granules and dark cell (tumoral myoepithelium) without filament structures. Ultrastructural findings suggest that the tumor cells are poorly differentiated.
Postoperatively, the patient made an uneventful recovery and the wound healed satisfactory. There had been no evidence of recurrence, nor any metastasis of this tumor until the last regular observation.
