Abstract
Cystadenoma is a rare salivary gland benign tumor and consists of monolocular or multilocular cysts in the tumor. This type of tumor accounts for 2–4.7％ of all minor salivary gland tumors and it usually occurs on the lip, palate, and buccal mucosa, but rarely in the retro-molar region. We present a case of cystadenoma arising from the left retro-molar region in an 83-year-old male patient. The clinical evaluation showed a solitary mass of 15×18mm which was elastic soft, with a smooth surface, partially purply blue color, and a clear border. The MRI findings revealed that the tumor was well defined with rim-enhanced mass. The clinical diagnosis was a benign tumor. The lesion was resected under general anesthesia, and the histopathological diagnosis was cystadenoma. There was no evidence of recurrence 3 years after resection.
