Giant air cysts of the lung were found in 6 of 180 patients admitted to the hospital with spontaneous pneumothorax. The preoperative diagnosis was established in all the patients on the basis of their past history, clinical course, X-ray examination and puncture of the pleural cavity. The operative treatment of cysts of the lung is recommended. All the 6 patients were operated upon with good results (in 3 patients--lobectomy, cysts were removed in 3 patients).

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