Diseases of the chest and the principles of physical diagnosis . e. ^ Virchows Archiv, Band cxiv, S. 191, Miinchner Med. Woch., Ivii, Xo. 9, Brit. Med. Jour., Feb. 14, 1903. * Diseases of the Bronchi, Lungs and Pleura, Virchows Archiv, cxxi, , 1913. 8 Loc. at. ^ Amer. Jour. Med. Sc, cxxv, 1903. * Stevens, Am. Jour. Med. Sc, cxliv, 1912.^ Am. Jour. Med. Sc, August, 1916. 544 DISEASES OF THE BRONCHI, LUNGS, PLEURA, AND DIAPHRAGM Byi|[far the commonest tumors involving the mediastinum are thosecomprising the malignant group. Hare in 1889 collected 520 instancesof^mediasti
Diseases of the chest and the principles of physical diagnosis . e. ^ Virchows Archiv, Band cxiv, S. 191, Miinchner Med. Woch., Ivii, Xo. 9, Brit. Med. Jour., Feb. 14, 1903. * Diseases of the Bronchi, Lungs and Pleura, Virchows Archiv, cxxi, , 1913. 8 Loc. at. ^ Amer. Jour. Med. Sc, cxxv, 1903. * Stevens, Am. Jour. Med. Sc, cxliv, 1912.^ Am. Jour. Med. Sc, August, 1916. 544 DISEASES OF THE BRONCHI, LUNGS, PLEURA, AND DIAPHRAGM Byi|[far the commonest tumors involving the mediastinum are thosecomprising the malignant group. Hare in 1889 collected 520 instancesof^mediastinal affections and of this number he classed 134 as carcinoma,and 98 as sarcoma. ^lany of the cases included in his analysis werereported at a time when the histological distinction between the twotypes of mahgnant tumors was not fully understood. Now that thenature of these tumors is better known it is recognized that .sarcoma ismuch more common than carcinoma. Endothelioma rarely invades themetliastinum primarily; it may extend from a primary pleural Fig. .320.—Colloid carcinoma. Morbid Anatomy.—Benign tumors occurring in the lungs or bronchiare quite rare. They usually involve some one of the mediastinal struc-tures. As has already been stated a tumor involving either the lungs orbronchi is usuall}^ malignant. It is frequently asserted that in primarycarcinoma of the lungs and bronchi that the right side is more frequentlyinvolved than the left. Adler^ states that the difference in the involve-ment of the two sides is too small to serve as a basis for a theory. Weller^ 1 Primarj- Malignant Growths of the Lungs and Bronchi, 1911. 2 Loc. cit. DISEASES OF THE LUNGS 545 found that in 69 cases the two sides were involved with approximatelyequal frequency. Primary sarcoma is also quite as apt to occur on oneside as the other. Primary malignayit growths may occur as a single large tumor havingits origin in the root of the lung and extending into the pulmonary tissueor
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