A Case of Follicular Carcinoma Associated with Hashimoto's Thyroiditis Arising in a Thyroglossal Duct Remnant / 대한내분비학회지

ABSTRACT

Thyroglossal duct remnants are common congenital abnormalities of the thyroid development but malignant tumors arising in the thyroglossal duct remnants are rare, occuring in less than 1%. In the literature, about 160 cases of malignancy in the thyroglossal duct remnant have been reported. Among the various types of carcinoma being found from the thyroglossal duct remnants, most are papillary carcinoma(79.8%) and Mixed follicular-papillary carcinoma(9.5%). Others are squamous cell carcinoma(7.6%), follicular carcinoma(1.2%), and anaplastic carcinoma(0.6%). Hashimotos thyroiditis is a common autoimmune disease of the thyroid gland. Malignant tumors of the thyroid gland with Hashimotos thyroiditis are rare disorder except malignant lymphoma whose association with Hashimotos thyroiditis is well known. Malignant tumors associated with Hashimotos thyroiditis arising in a thyroglossal duct remnant are extremely rare. Recently the authors experienced a case of follicular carcinoma associated with Hashimotos thyroiditis arising in a thyroglossal duct remnant, which was removed by local excision and reported with literature review.