Papillary carcinoma in thyroglossal duct cyst: A case report.

A thyroglossal duct cyst is a benign congenital lesion present in 7% of the population. Malignant transformation is rare, with an incidence of 1%, 90% of which are papillary carcinomas. We report the case of a 36-year-old woman with an asymptomatic 2.