[A case of adenomatoid odontogenic tumor].

The patient was a girl in her teens. A panoramic radiograph revealed an impacted canine and a mixture of radiolucency and radiopacity in the right sinus. The patient was referred to the Dental Clinical Division, Hokkaido University Hospital. She had no subjective symptoms. A slight bone expansion from the base of the right ala of the nose to the infraorbital region was palpable, but no tenderness or paresthesia was noted. A CT image indicated a tumor mass shadow with fine-grained sand radiopacity contained in the impacted canine in the right sinus. The patient was pathologically diagnosed as having an adenomatoid odontogenic tumor by biopsy and underwent tumor resection. The 40 × 28 mm tumor had a capsule and contained the canine and sand granule-like hard materials. The tumor cavity was washed out with a saline solution through the bone defect formed after tumor extirpation in the anterior wall of the maxillary sinus, and the cavity was closed 1 year later. Approximately 5 years since the operation, neither relapse of the tumor nor deformation of the maxilla has been observed.