图示肺不张，见右肺萎陷。图示血液充满胸膜腔(血胸),导致肺不张。但是肺不张也可由胸腔内充满气体（气胸）、漏出液（胸水）、淋巴(乳糜胸)，或者脓性渗出物（脓胸）引起。
The right lung is collapsed. This is atelectasis. In this case, blood filled the pleural cavity (hemothorax), but atelectasis could also result from filling the chest with air (pneumothorax), transudate (hydrothorax), lymph (chylothorax), or purulent exudate (empyema).
