During the last few years, I have had an opportunity to observe a number of cases of sarcoma of the lung, some of them primary, a number of them metastatic. At this time, I desire to relate only one case of rather unusual interest, and at the same time briefly refer to some of the other cases which have come under my observation. An exhaustive study of these cases will be made when sufficient time has elapsed in the cases in which the patients are still living.
Intrathoracic neoplasms are now more frequently discovered than in the preroentgen-ray period. By means of stereoroentgenograms, we may discover accidently well defined tumor shadows in a chest where no tumor was suspected. A well trained roentgenologist will be able to interpret their meaning. The outline, the shape, size and location of the shadow will enable him to determine, with considerable certainty, as to