Introduction：Ectopic thyroid refers to the presence of thyroid tissue in locations other than its usual position between the second and fourth tracheal rings. It is more common in women, and although ectopic thyroid tumors can occur, malignant transformation is rare, accounting for approximately 3% to 0.5% of thyroid cancers[1,2]. Clinical manifestations of ectopic thyroid carcinoma lack specific characteristics but may include a painless neck lump or tongue tumor causing discomfort and difficulty swallowing due to compression on the trachea or esophagus, leading to breathing or swallowing difficulties. Imaging findings typically show solid masses or mixed cystic and solid lesions. Nuclear imaging using radioactive iodine (131I) can be used as the preferred diagnostic method for ectopic thyroid after excluding metastatic thyroid cancer; if radioiodine uptake is detected outside the normal location, an ectopic thyroid diagnosis can be made. Surgical resection remains the primary treatment option for ectopic thyroid cancer.
