现已证明肺化脓症和吸入性肺炎90%以上是由厌氧菌所致,细菌性肺炎中厌氧菌的比例意外地高也是可以想像的。厌氧菌的特性是容易产生化脓性,坏死性病变,形成空洞或合并胸膜炎。从是否有空洞及胸膜炎角度,将厌氧菌所致的呼吸器官感染的胸部X线表现大致分为4型:①肺炎,②肺化脓症,③坏死性肺炎,④合并脓胸。据文献报道,病灶多数位于下叶或背 It has been demonstrated that more than 90% of pulmonary suppurative and aspiration pneumonia are caused by anaerobic bacteria. It is also conceivable that the proportion of anaerobic bacteria in bacterial pneumonia is unexpectedly high. The characteristics of anaerobic bacteria are prone to purulent, necrotic lesions, the formation of voids or merger pleurisy. From the perspective of whether there are holes and pleurisy, the anaerobic bacteria caused by respiratory infection of the chest X-ray performance is roughly divided into four types: ① pneumonia, ② pulmonary suppurative, ③ necrotizing pneumonia, ④ merge empyema. According to the literature, most of the lesion is located in the lower lobe or dorsal