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Bilateral epithelial-myoepithelial carcinoma of the parotid glands
Kayoko Hattori1, Norihiko Murai1, Junko Kusano2
1Department of Otolaryngology, Kyoto-Katsura Hospital, Kyoto, Japan.
Background:
The most common histological diagnosis of bilateral parotid gland neoplasm is Warthin tumor. Bilateral malignant tumors of the parotid gland are extremely rare.
Methods:
A 60-year-old man presented with a painless mass in the right preauricular area and an MRI scan showed multiple masses in the parotid glands, bilaterally. A standard superficial parotidectomy was performed on the right parotid gland followed by subtotal parotidectomy on the left. The diagnosis was synchronous bilateral epithelial-myoepithelial carcinoma arising in the parotid glands.
Results:
Histopathology of the tumor on both sides indicated epithelial-myoepithelial carcinoma. There was no evidence of locoregional or remote disease during a 5-year follow-up period.
Conclusion:
Malignant tumors should be included in the differential diagnosis of bilateral parotid gland tumors. Management of unilateral malignant parotid tumors should involve careful observation of the contralateral parotid gland.
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