Lateral neck ectopic papillary thyroid carcinoma: A rare case report.

Introduction: Ectopic thyroid tissue (ETT) occurs due to abnormal embryogenesis of the thyroid gland. Ectopic thyroid tissue is susceptible to all the processes that affect normal thyroid tissue, including malignant transformation. Malignancy of ectopic thyroid tissue is known as the exceedingly rare phenomenon of ectopic thyroid carcinoma (ETC).