Cystadenoma lymphomatosum or Warthin's tumor of the parotid glands appears bilateral in 8-10% of cases, synchronous (rarely), metachronous (frequently) and sometimes with multicentric aspects. After the review of the epidemiological, pathogenetic, clinical, radiographic and histologic data, the authors present two cases of bilateral Warthin's tumor, metachronous (7 years), nodular-isolated in the first one and metachronous (5 years), nodular-multicentric in the second one. The patients after CAT scan and NMR examinations, and a fine needle aspiration biopsy were treated with superficial parotidectomy with preservation of the facial nerve. In our experience the management of patients affected by Warthin's tumors, needs the following steps: CAT scan and NMR examinations to outline multiple and bilateral lesions, fine needle aspiration biopsy, superficial parotidectomy with preservation of the facial nerve, an extended follow-up (10 years after the last surgery).