Primary sarcoma of the lung is generally conceded to be a relatively uncommon disease. Hertz (1874) denied the existence of this condition, stating that every sarcoma found in the lung had its origin elsewhere. Adler (1912), asserting that he had never seen a case of primary sarcoma of the lung, expressed astonishment at the number of cases reported in the literature. In his book on "Primary Malignant Growths of the Lung and Bronchi," published in 1912, Adler presented a review of 374 cases of primary carcinoma of the lung and 90 primary sarcomas. In 1926, Barnard pointed out that the "oat-cell sarcoma" of the lung is in reality of carcinomatous origin. Four years later, Karsner and Saphir showed that another lesion, one previously described as a "small cell or lymphosarcoma" of the lung, was of epithelial origin and therefore also a carcinoma rather than a sarcoma. Reviewing the work of