根据以上信息,初步判断患儿诊断:(1)胸腔积液原因待查(肿瘤性?);(2)支气管肺炎。需要进一步完善胸部增强CT、骨髓穿刺及胸腔积液免疫分型、腹部增强CT,注意积液病理结果回报。检查结果如下。(1)胸部增强CT:上纵隔软组织团块影,包绕头臂静脉,受压变扁,上腔静脉明显受压变扁,右主支气管管腔明显变窄,右肺大片实变影,胸壁内缘弧形液体密度影,腔静脉后、隆突下、食管旁大量肿大淋巴结, According to the above information, a preliminary diagnosis of children diagnosed: (1) causes of pleural effusion to be investigated (neoplastic?); (2) bronchial pneumonia. Need to further improve the chest enhanced CT, bone marrow puncture and pleural effusion immunophenotyping, abdominal enhanced CT, pay attention to the results of hydrothorax return. The test results are as follows. (1) thoracic enhanced CT: soft tissue mass mediastinum shadow, around the brachiocephalic vein, pressure becomes flat, the superior vena cava pressure was flattened, the right main bronchial lumen was significantly narrowed, Chest wall arched liquid density shadow, after the vena cava, next to the carina by a large number of enlarged lymph nodes,