Manual of pathology : including bacteriology, the technic of postmortems, and methods of pathologic research . oma elsewhere. The epitheliomata rarely, ifever, the scirrhus more commonly, and the encephaloid most frequently, 41 626 SPECIAL PATHOLOGY. occur as secondary growths in the lung. The cancers, spreading bythe lymphatics, usually involve those structures in the lung first, andmanifest dissemination along the course of the the pleura by the lymphatic system, dissemination may occuralong the course of the interlobular lymph-vessels, in which will be seenthe grayis
Manual of pathology : including bacteriology, the technic of postmortems, and methods of pathologic research . oma elsewhere. The epitheliomata rarely, ifever, the scirrhus more commonly, and the encephaloid most frequently, 41 626 SPECIAL PATHOLOGY. occur as secondary growths in the lung. The cancers, spreading bythe lymphatics, usually involve those structures in the lung first, andmanifest dissemination along the course of the the pleura by the lymphatic system, dissemination may occuralong the course of the interlobular lymph-vessels, in which will be seenthe grayish cancerous lines traversing the connective-tissue septa, andeven extending to the peribronchial lymph-nodes. Carcinoma occasionally reaches the lung by the blood, and thefrequency with which this is associated with an initial focus in thedigestive organs, more especially that part of the alimentary canalthat communicates with the chyle duct, apparently explains this formof dissemination; in reality, the cancer cells have reached the bloodby being poured into the venous circulation through the lymph-chan-. FiG. 308.—Lung, Part OF Serous Surface; Secondary larger distinctly elevated masses are the oldest; similar smaller nodules are more recent, while the youngestgrowths are «hown as minute (miliary) grayish-white or white subserous dotlets. The specimen is a partonly of the lower lobe; reproduction natural size. The incised surface of the same specimen is shown mFig. 309. nels arising in the abdominal cavity. When a cancerous emboluslodges in the lung, the growth immediately proceeds in the usual way;as these emboli are commonly multiple and are fairly abundant, bothlungs are likely to be involved, and many small tumors occur morefrequently than a single large one. There can be found, of course, noregularity in their location, and, once lodged, they follow the sameprocesses of growth and local dissemination that have already been in-dicated ; the encephaloid is t
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