Papillary Thyroid Carcinoma of a Large Thyroglossal Duct Cyst: A Case Report

Abstract

Background: Thyroglossal duct cyst is the most common congenital anomaly of the thyroid gland. Carcinoma arising from it is rare which composes 1% of total cases, often diagnosed incidentally after surgical excision. Here we are reporting a case of papillary thyroid carcinoma of thyroglossal cyst in 45-year-old female with normal thyroid gland. Case Description: A 45-year-old female presented with 1 year history of swelling over midline of the neck with normal thyroid gland. FNAC suggested a benign cystic lesion, most likely thyroglossal cyst. CT scan neck showed a well-defined lobulated and septated thin-walled cystic lesion of approx. 6×4×5cm in the midline upper infrahyoid region anterosuperior to thyroid, suggestive of thyroglossal cyst. Sistrunk procedure was performed. HPE revealed papillary thyroid carcinoma of thyroglossal cyst. Conclusion: A case of thyroglossal duct cyst with normal thyroid gland and without any clinical or radiological evidence of malignancy, a possibility of underlying malignancy should be kept in mind and can be managed adequately with Sistrunk procedure only, with regular follow up.