Low-grade malignant myoepithelioma arising in a pleomorphic adenoma: a rare case

ABSTRACT

Malignant myoepithelioma is a very rare salivary gland tumor that can arise de novo or within a preexisting pleomorphic adenoma. We report a case of malignant myoepithelioma most probably arising in a pre-existing pleomorphic adenoma of the left parotid gland. The patient was a 60-year-old man who presented with a multinodular mass lesion over left side of the face and neck. He had undergone removal of a pleomorphic adenoma of the left parotid gland twice [8 and 22 years ago]. Histological examination showed locally concentrated highly invasive myoepithelial cells with bland-looking morphology and no evidence of mitosis or necrosis. Immunohistochemistry confirmed the myoepithelial differentiation [S-100+, SMA+] and a low Ki-67 labeling index [<5%]