[Differential diagnosis of cystic formation in the lungs].

Twenty cystic formations in the lung were studied in 9 male and 11 female patients. The study was based on the principle of correlation of clinical, roentgenological and morphological data. In 12 cases solitary pulmonary cysts were recognized. All of them proved to be pseudocysts, i. e. of an inflammatory-destructive origin: as a cleared abscess (5) or sanated tuberculous cavern (7). The cavities of true (bronchial) cysts were studied in 6 observations. It has been found that they are conditioned by previous tuberculous bronchoadenitis and related with scarring stenosis of bronchi. In one observation a cystic pulmonary formation was doubtlessly of a congenital character and proved to be an extrapulmonary bronchial cyst (extralobar sequestration).