患者女，32岁。因胸闷、胸痛、呼吸不畅半年入院。体检：右肺呼吸音低，右上肺叩实，纵隔叩诊浊音区增宽，心脏听诊无异常。X线胸片见右前中上纵隔呈巨大圆形影向外突出，边缘光滑，密度均匀，境界清晰。侧位肿块突出于前中上纵隔区，后界与心影重叠。透视下无搏动。CT检查：平 Female patient, 32 years old. Due to chest tightness, chest pain, poor breathing six months admitted to the hospital. Physical examination: The right lung has a low breath sound, and the upper right lung is tamped. The mediastinum of the mediastinum is widened and the heart auscultation is not abnormal. The X-ray showed a large circular shadow protruding from the right anterior middle and superior mediastinum, with smooth edges, uniform density, and clear boundaries. The lateral mass protrudes from the anterior middle and superior mediastinal area, and the posterior boundary overlaps with the heart shadow. No pulsation under perspective. CT examination: flat