LAUSR

Salivary gland tumors are a very heterogeneous group of lesions. According to the histological classification published by WHO in 2005, 10 types of benign and 24 types of malignant tumors of the salivary glands can be distinguished. All of these lesions are relatively rare, and represent only 3--4% of head and neck tumors. 80% of them are located within the parotid gland, and they usually present as a single parotid lesion. Unilateral parotid neoplasms are very uncommon, and they usually have the same histological type. The most common type of such a lesion is Warthin tumor (6--12% of all adenolymphomas). The coexistence of tumors of different histological types in the same parotid gland constitutes less than 0.3% of all salivary gland neoplasms. The most common histological combination is Warthin tumor and pleomorphic adenoma. Two different unilateral parotid neoplasms can be metachronous or synchronous. However, even when more