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结核菌第一次经呼吸道或消化道侵入小儿机体后发生初次感染,常在肺部和肠道形成原发性病灶(90％左右发生在肺部)。原发性肺结核是小儿肺结核的主要类型,包括原发综合征和支气管淋巴结结核。其实,二者无原则区别,前者只是肺部原发灶和局部肿大的淋巴结同时存在,后者是以胸腔内淋巴结肿大为主,肺部原发病灶或因极小、或因已经吸收,在X线检查时看不出来。肺部原发病灶多在肺上叶底部和下叶的上部,以右肺为多见。病灶可为单个或两个以上。开始时病灶
Mycobacterium tuberculosis first infection through the respiratory tract or digestive tract in children after the occurrence of primary infection, often in the lungs and intestines to form primary lesions (90% occurred in the lungs). Primary tuberculosis is a major type of tuberculosis in children, including primary syndrome and bronchial tuberculosis. In fact, there is no principle difference between the two, the former is only the primary lung and local enlargement of the lymph nodes exist, the latter is mainly intra-thymus lymph nodes, primary lung lesions or because of minimal, or because it has been absorbed , X-ray examination can not see it. Primary lung lesions and more in the upper lobe of the upper lobe and lower lobe, more common to the right lung. The lesions can be single or two or more. The beginning of the lesion