Oncocytomas are rare benign tumors that occur most commonly in the parotid glands, but are also well known to arise in organs such as the salivary glands, kidneys, and thyroid. Herein, we present a case of metachronous and bilateral oncocytoma of the parotid glands, with a review of the literature. The patient was a 78-year-old woman who was referred to our department for surgical treatment of multiple tumors in the right parotid gland. The patient gave a history of having undergone total left parotidectomy 23 years earlier for multiple tumors in the left parotid gland, and postoperative histopathology had revealed the diagnosis of oncocytoma. At the current presentation as well, both the intraoperative pathological and intraoperative findings suggested benign tumors, and we performed a total right parotidectomy while preserving the facial nerve. Although there has been no recurrence since the surgery, we believe that close follow-up and monitoring are necessary as there have been reports of recurrence as well as malignant transformation.
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