During the past few years, there have been many important advances in the diagnostic method of thoracic conditions. Among the more valuable additions may be mentioned the use of iodized oil and of diagnostic pneumothorax. Scarcely less important is the selection of the position most favorable for obtaining information in fluoroscopic and roentgen examination. Any one or all of the new methods may be applicable in the individual patient. It has been possible for us to combine these methods in a most satisfactory manner because of the existence of the chest service of Barnes Hospital where there is a specially trained personnel and all necessary equipment for the most detailed examination.
In no class of cases is the proper use and selection of methods more necessary than in the diagnosis of tumors of the lung.
This study is concerned with a series of tumors observed by Dr. Evarts Graham and