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Sclerosing mucoepidermoid carcinoma with eosinophilia of the thyroid--a case report.

We report a 55-year old female who presented with thyroid swelling for six months. She was clinically asymptomatic with normal thyroid functions. Thyroidectomy revealed the left lobe totally replaced by a well-circumscribed grey white homogenous tumor. Microscopically, the tumor comprised of cells arranged in adenoid pattern along with nests of cohesive intermediate cells, some also forming keratin pearls in a sclerotic and inflammatory background. The thin rim of thyroid at the periphery showed features of lymphocytic thyroiditis. No other associated malignancy was seen on thorough screening. The tumor cells were negative for thyroglobulin and calcitonin. The patient was thus diagnosed with Sclerosing mucoepidermoid carcinoma with eosinophilia, thyroid.