Low-grade malignant myoepithelioma arising in a pleomorphic adenoma: a rare case
Annals of Saudi Medicine. 2012; 32 (2): 209-212
em Inglês
| IMEMR
| ID: emr-118102
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%]
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Índice:
IMEMR (Mediterrâneo Oriental)
Assunto principal:
Neoplasias das Glândulas Salivares
/
Adenoma Pleomorfo
/
Mioepitelioma
Tipo de estudo:
Relato de Casos
Limite:
Humanos
/
Masculino
Idioma:
Inglês
Revista:
Ann. Saudi Med.
Ano de publicação:
2012
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