Multiple bilateral synchronous Warthin's tumors: a case report and review of the literature.

Warthin's tumor is a relatively uncommon and biologically fascinating neoplasm of salivary glands. Bilateral simultaneous parotid Warthin's tumors have been reported previously, as have multiple unilateral tumors. However, an extensive search of the English and non-English medical literature revealed only two previous reports of multiple bilateral Warthin's tumor presenting simultaneously. We report a third case, and review the unique embryological origin and biological characteristics of this entity.