Vol.98 No.4 contentsPRACTICA OTO-RHINO-LARYNGOLOGICA
Vol. 98 No. 4 April 2005
A Case of Myoepithelioma in the Parotid Gland
Ryusuke Hori, Makito Tanabe and Hideaki Ogita
(Nishi-Kobe Medical Center)
Myoepithelioma is a rare tumor accounting for less than 1％ of all salivary gland tumors. We report a case of plasmacytoid myoepithelioma arising in the parotid gland.
A 66-year-old woman with a painless swelling of the left parotid gland was referred to our hospital in October, 2003.
Computed tomographic examination revealed a well circumscribed mass contrasted by heterogeneity. On magnetic resonance imaging, T2-weighted images revealed high signal intensity mass, measuring 2.5×1.5×3.2 cm. Needling aspiration diagnosis was negative. The tumor was surgically removed under a clinical diagnosis of a benign tumor.
Pathologically, the tumor was diagnosed as myoepithelioma (plasmacytoid cell type). Immunohistochemically, the tumor was stained with S-100 protein, cytokeratin and a smooth muscle actin.
There was no evidence of recurrence 9 months after the surgery.
Key words : myoepithelioma, parotid gland, plasmacytoid cell type