Clinical points in diagnosis and treatment of mucoepidermoid tumor of the parotid gland ; Review of our cases

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Two hundred and sixty-eight patients with parotid tumor were treated in our department from 1985-1994. Eight patientd (3 %) were with mucoepidermoid tumor. In all 8 cases, tumors were partially fixed to surrounding tissues. However, facial paralysis and pain were noted in one patient respectively. Seven patients were examined ultrasonographically. Malignant pattern was found in 6 cases and intermediate pattern in one, and boundary echo was unclear in all cases. Aspiration biopsy was performed in 6 cases ; malignancy was suggested in 5 cases, and 2 were diagnosed as mucoepidermoid tumor. Total parotidectomy with removal of involved surrounging tissue was done in all 8 patients. A regional lymph node dissection was done in 5 cases, and 2 had lymph node metastasis. Postorative radiotheraphy was done in 4 cases. Generally, a progonsis of mucoepidermoid tumors is good except for high grade malignant tumor, which have predominent epidermoid cells. In our cases, one have died of disease, and 7 patients are alive with no evidence of tumors. We propose a new histological grading criteria for mucoepidermoid tumors. Recommendations for treatment should be based no a histological grading of the tumor.
特定非営利活動法人日本頭頸部外科学会の論文