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A detailed histopathological study was done on autopsied cases of primary lung cancer to search for the histopathological characteristics in pulmonary infections, especially pneumonia seen in these invasive cases of lung cancer. The following results were obtained: 1) Among 101 cases of primary lung cancer autopsied in our institude during the 5 years period from 1978 to 1982, histopathological pictures suggesting bacterial pneumonia were found in 46 cases (45.5%), and were apt to be seen in cases with epidermoid carcinoma and small cell carcinoma. 2) Various types of histopathological pictures showing a process from acute to organizing phases of pneumonia were found in these cases, and were divided arbitrarily into mainly 6 types on the viewpoint of the progressing of pneumonic process. Various types of pictures were often present in one case, but as the common point, pictures showing the processing to the fibrosis of the exudates were found in many of the cases (27 cases, 58.7%). 3) In most of the cases (7 out of 10 cases) of organizing pneumonia that involved a large part of a lobe, the related bronchus was found morphologically to have a severe impairment in its drainage caused by the tumor. In the remaining 3 cases which showed only changes of chronic bronchitis in the related bronchus, organizing pneumonia involved a relatively smaller area. 4) Gram negative bacilli such as Pseudomonas aeruginosa, Haemophylus influenzae, and Klebsiella pneumoniae were the main microorganisms isolated from sputa obtained durning the last pneumonic episodes before the patients' death. But there was no distinct difference between the histologic reactions to various types of bacteria in these cases. 5) The complication of the pulmonary mycotic diseases, although not diagnosed before the patients' death, was found in 7 cases, accounting for 13.2% of all cases with complications of pulmonary infections (53 cases).
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