Metachronous bilateral multifocal nodular oncocytic hyperplasia of the parotid gland.

Multifocal nodular oncocytic hyperplasia (MNOH) is a rare lesion of the parotid gland and bilateral cases are extremely rare. We report the case of a 69-year-old woman who was operated from MNOH 10 years ago and the bilateralism of the case appeared 10 years later making the case metachronous.