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Papillary carcinoma arising in a thyroglossal duct cyst; two case reports and review of the literature.

We present in this report two cases of papillary carcinoma arising in a thyroglossal duct cyst. The first case was a 32-year-old female patient who presented with a neck mass of 5 years' duration that had recently increased in size. The patient was otherwise asymptomatic. The second patient was a 41-year-old male patient who presented with a submental mass that had been growing over the previous several months. Associated symptoms included local symptoms such as dysphagia and hoarseness and general symptoms such as fatigue and weight loss. Pathological examination revealed the presence of papillary carcinoma in the mass with presence of focus of papillary carcinoma in the thyroid bed in both cases. Periosseous invasion of the hyoid bone and involvement of the submandibular lymph nodes were observed in the second patient. The patients underwent total thyroidectomy with lymph node dissection followed by radioactive iodine therapy and are currently on thyroxin replacement.