Bilateral parotid gland basal cell adenomas - Case report

We report a 65-year-old female with basal cell adenomas arising in the left and right parotid glands and review the literature. Diagnosis was based on clinical features, ultrasonographic and CT findings as well as histopathol ogical examination. Parotid tumours usually arise on one side and bilateral occurrence is rare, accounting for 1-3% of all parotid tumours, Most bilat eral parotid tumours are Warthin's tumours and pleomorphic adenomas, and bi lateral basal cell adenomas of the parotid glands are very rare and only 5 cases including ours have been reported. The exact mechanisms contributing to the development of bilateral parotid tumours remain unknown. We speculat e on the involvement of environmental and genetic factors since the histolo gical features of both parotid tumours are identical in most cases. Copyrig ht (C) 2000 S. Karger AG, Basel.