“…The patient experienced chest pain following transurethral resection of the bladder, multiple metastases were discovered during PET/CT, rib biopsy, and FNA of thyroid nodules confirmed the presence of urothelial metastases, but no further treatment was given, and the patient passed away 6 months later. The first instance of bladder urothelial carcinoma spreading to the thyroid gland was proposed in 2014 ( 7 ). The second case, which initially discovered thyroid nodules, was proposed in 2016; subtotal thyroidectomy was performed, and postoperative pathological results suggested undifferentiated carcinoma of the thyroid gland.…”