A case of adenolymphoma of parotid gland associated with squamous cell carcinoma of the floor of the mouth.

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Adenolymphoma is a fairly rare benign epithelial tumor of the salivary glands and it occurs most frequently in the region of the parotid gland. Adenolymphoma associated with other tumors is extremely rare. Recently, we had a case of adenolymphoma of the parotid gland associated with the squamous cell carcinoma of the floor of the mouth. The patient, a 63 year-old man, visited our hospital with a chief complaint of an ulcer on the left floor of the mouth. The biopsy of the region was his topathologically diagnosed as squamous cell carcinoma.Then he was received radiation therapy and radical surgery. Clinically, d small finger tip sized tumor mass was found adjacent to the left parotid gland and was removed surgically. The tumor mass measured 0.8×0.7×0.5cm in size, encapsulated by fibrous connective tissues. Histologically, the tumor had epithelial and lymphoid component. The epithelium consisted of cells arranged in double layers around cystic or duct-like spaces. In a part of the tumor denudation of the epithelial cells and leakage of the mucous material into the lymphoid stroma were also seen. In this case, clinically the tumor mass adjacent to the left parotid gland was suspected to be the metastasis of the squamous cell carcinoma. But histopathological examination revealed that the tumor was adenolymphoma.
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