肺部感染是指致病微生物引起的终末气道、肺泡及肺间质的炎症。常见的致病微生物有细菌、真菌、支原体、衣原体、病毒、寄生虫等。肺部多发结节性病变为一侧或两侧肺野内有2个或更多的较局限的类圆形或不规则病灶,病灶大小各不相同,分布不一定对称。病灶直径一般多在1cm以上,小 Pulmonary infection is the inflammation of the terminal airways, alveoli, and lung interstitium caused by pathogenic microorganisms. Common pathogenic microorganisms are bacteria, fungi, mycoplasma, chlamydia, viruses, parasites and so on. Pulmonary multiple nodular lesions in one or both sides of the lung field there are two or more more limited class of round or irregular lesions, lesions vary in size, the distribution may not be symmetrical. Lesion diameter more than 1cm in general, small