A Case of Cystoadeno Carcinoma in the Retromolar Region

DATE Kiwako, KAMATANI Takaaki, YOSHIHAMA Yasuto, ISOBE Tomohide, TACHIKAWA Tetsuhiko, SHINTANI Satoru

doi:10.7881/dentalmedres.31.41

Cystadenocarcinoma of the salivary gland is rare malignant tumor. It has previously been called malignant papillary cystadenoma, mucous-producing adenopapillary carcinoma, lowgrade papillary adenocarcinoma, and papillary adenocarcinoma. We present a rare case of a malignant salivary gland tumor arising in the retromoler of a 30-year-old Japanese man. He presented with a history of a mass on the left lower gingiva. Intraoral examination revealed a tumor about 5 mm diameter on the left side of retromolar region of the mandibule. The tumor was soft, non-tender, and did not adhere to the mucosa. Under the clinical diagnosis of benign tumor of the mandible, an excision of the tumor biopsy was performed. After the histopathological diagnosis of malignant tumor of the salivary gland was established, complete excision of the tumor with a minimum of 1 cm tumor-free margins was performed again. The histological examination revealed normal oral mucosa overlying part of a tumor that appeared to be arising from, and destroying, a minor salivary gland. Moderate nuclear pleomorphism was evident with few mitotic cells. The lesion was diagnosed as cystadenocarcinoma. After surgical removal of the lesion and the adjacent tissues, the patient had been referred to our department and remains well almost 6 months later.

A Case of Cystoadeno Carcinoma in the Retromolar Region

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