Bilateral Synchronous Mucoepidermoid Carcinoma of the Parotid Gland.

Mucoepidermoid carcinoma is the most common malignant tumor of the parotid; however, its synchronous occurrence in both of the parotid glands is extremely rare. Herein, we presented a case of 53-year-old man with bilateral synchronous mucoepidermoid carcinoma of the parotid gland treated with surgery. The patient mainly complained of a painless mass in the left parotid gland. A mass located in the right parotid gland was incidentally detected by imaging. Based on cytopathology, left total parotidectomy was performed while preserving the facial nerve with ipsilateral neck dissection, and 5 weeks later, right superficial parotidectomy was performed. At the 3-year follow-up, there was no recurrence in the parotid regions and the neck. A detailed examination for parotid masses is suggested for identifying possible occult synchronous tumors in the contralateral side or in other salivary glands. A close follow-up is also recommended for the risk of future occurrence of metachronous tumors.