胸内甲状腺肿多位于前上纵隔内 ,位于中后纵隔者较少见 ,现报告 2例如下 :例 1　患者 ,男 ,5 6岁。因患感冒后咳嗽 ,胸部透视时发现纵隔内肿物。无胸闷、气短、吞咽困难等不适症状。查体 :颈部甲状腺及周身浅表淋巴结无肿大 ,实验室检查未见异常。MRI检查所见 :中上纵隔内有一 Intrathoracic goiter in the anterior superior mediastinum, located in the post-mediastinal less common, are reported as follows 2 cases: 1 patients, male, 56 years old. After suffering from a cold cough, chest X-ray found mediastinal masses. No chest tightness, shortness of breath, swallowing difficulties and other symptoms. Examination: Neck thyroid and superficial lymph nodes throughout the body without swelling, laboratory tests showed no abnormalities. MRI examination seen: in the mediastinum one