Synchronous Bilateral Multifocal Warthin's Tumor Mimicking Primary Malignancy on F-FDG Whole Body PET/CT in a Case of Metastatic Cervical Lymph Nodes from Unknown Primary Malignancy.

Warthin's tumor is a benign and frequently encountered salivary gland neoplasm. Bilaterality and multifocality are rare in Warthin's tumor. Synchronous cervical lymph nodal metastasis with unknown primary in a case of Warthin's tumor can raise a suspicion of primary malignancy of the parotid gland.