Indian Journal of Pathology and Microbiology
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Year : 2018  |  Volume : 61  |  Issue : 4  |  Page : 564-566

Dedifferentiation of oncocytic epithelial–myoepithelial carcinoma to mucoepidermoid carcinoma in parotid gland: A rare case report

1 Department of Pathology, Maulana Azad Medical College and Associated Lok Nayak Hospital, New Delhi, India
2 Department of ENT, Maulana Azad Medical College and Associated Lok Nayak Hospital, New Delhi, India

Correspondence Address:
Meeta Singh
K-171, Sarita Vihar, New Delhi - 110 076
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/IJPM.IJPM_64_17

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Epithelial–myoepithelial carcinomas (EMCs) account for <1% of all salivary gland malignancies. Till now, 23 cases of dedifferentiated EMC have been reported to the best of our knowledge. However, dedifferentiation of oncocytic EMC to mucoepidermoid carcinoma is extremely rare. A 38-year-old female presented with right post aural swelling 4 cm × 2 cm in size for 6 months. Surgical excision was carried out, and we received partly skin-covered tissue 5 cm × 2 cm in size. Sections examined showed features of oncocytic EMC dedifferentiating into mucoepidermoid carcinoma. Myoepithelial component showed oncocytic change which was highlighted by p63.

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