TG and neoplasm: Based on the pathological diagnosis, postoperative examinations were performed, including neck ultrasonography, positron emission tomography (PET)-computed tomography (CT), blood tests [thyroid gland-related serological tumor markers such as Tg, thyroid-stimulating hormone, free triiodothyronine (T3), thyroxine (T4), and carcinoembryonic antigen], upper gastrointestinal digestive tract endoscopy, and plain chest radiography.