A CASE OF SUBMANDIBULAR GLAND ONCOCYTOMA WITH ACCIDENTAL PAROTID MUCOEPIDERMOID CARCINOMA

<p>Oncocytoma is considered to be a neoplastic proliferation of oncocytes, and are multicentric in the ducts, striatum, intervening and tufts of normal human glandular tissue. When oncocytoma undergoes malignant transformation, it is referred to as oncocytic carcinoma, and the frequency of occurrence has been reported to be about 16%. In principle, resection is desirable for treatment, and even in the case of follow-up, surgical treatment is required for cases with pain or rapid growth because malignant transformation of the tumor is suspected.</p><p>The patient was an 86-year-old, female who was diagnosed with a mass in the lower left jaw. She exhibited neoplastic lesions in the left submandibular and parotid glands, and underwent left submandibular gland tumor resection for the left submandibular gland tumor. She was subsequently diagnosed with oncocytoma. As she had a history of heart disease and was at risk of general anesthesia, she was followed up forbthe left parotid tumor, but it gradually increased and became painful, so she left ear 5 years later. After resection of the parotid tumor, she was diagnosed as having mucoepidermoid carcinoma based on the pathological results. No recurrence has been observed 1 year after the operation.</p><p>When multiple cervical tumors are found, even if one of them has been diagnosed as oncocytoma, early surgery is desirable, considering that the other tumors could be of different types or malignant.</p><p>Even in the case of simple follow-up, strict follow-up is required, always considering the possibility of malignancy.</p>