(六)肺不张:肺不张常常是由支气管内部因新生物、异物、血液、稠液、脓液、肉芽组织,水肿,炎变等引起支气管阻塞,或因瘤肿、纵隔淋巴结肿大、主动脈瘤等的外部压迫所致。肺不张的X线所见,根据不张的肺叶,呈均匀性的大片状緻密阴影,用高KV摄影时,也不会出现浓淡不等的阴影(有继发感染时,可出现支气管扩张、空洞等现象)。肺不张同时还引起患侧的肋间隙狭窄,横膈上升或纵隔移位,肺叶边缘(即肺裂隙)的 (F) atelectasis: atelectasis usually caused by a new bronchial internal organs, foreign body, blood, thick liquid, pus, granulation tissue, edema, inflammation caused by bronchial obstruction, or due to tumor, mediastinal lymph nodes , Aortic aneurysm caused by external pressure. Atelectasis of the X-ray findings, according to the atelectasis of lung lobes, was uniform large dense shadow, with high KV photography, there will be no shades of shades (secondary infection, there may be bronchus Expansion, empty and so on). Atelectasis at the same time also caused the affected side of the intercostal space stenosis, diaphragmatic ascending or mediastinal shift, the edge of the lungs (ie, lung fissure)