Fine needle aspiration diagnosis of benign oncocytic lesions of the head and neck associated with false positive 18 F-fluorodeoxyglucose uptake on positron emission tomography scan.

Oncocytic lesions including Warthin tumors can result in false-positive FDG uptake on PET scans. Clinicians and cytopathologists should be aware of PET-positive benign oncocytic head and neck lesions.