Diseases of the chest and the principles of physical diagnosis . the lumen of one ofthe larger bronchi. Instead of appearing as an isolated tumor formation the growth mayoccur in an infiltrating form. Wilson Fox describes two types of infiltra-tion. First, it may occur as a general infiltration in w^hich large areasof the lung are involved. This may be uniform or here and there tracesof pulmonarj^ tissue may remain intact. The process closely resembles 546 DISEASES OF THE BRONCHI, LUNGS, PLEURA, AND DIAPHRAGM a dense tuberculous infiltration (see Fig. 325). Secondly, the infiltra-tion may radi
Diseases of the chest and the principles of physical diagnosis . the lumen of one ofthe larger bronchi. Instead of appearing as an isolated tumor formation the growth mayoccur in an infiltrating form. Wilson Fox describes two types of infiltra-tion. First, it may occur as a general infiltration in w^hich large areasof the lung are involved. This may be uniform or here and there tracesof pulmonarj^ tissue may remain intact. The process closely resembles 546 DISEASES OF THE BRONCHI, LUNGS, PLEURA, AND DIAPHRAGM a dense tuberculous infiltration (see Fig. 325). Secondly, the infiltra-tion may radiate from the root of the lung by wsty of the lymphatic chan-nels attending the bronchi. Small or large tumor nodules or masses maybe seen surrounding the bronchi. In some instances the bronchi are butlittle involved and the lung tissue is chiefly affected. The carcinomatous growths are of a white, grayish or grayish-yellowcolor and are of firm consistency. When they occur in the lung tissuethey^are apt to be softer, and may break down and empty into a bronchus. FiQ. 322.—Large metastatic growth in right lung. left kidney. Primary growth a hypernephroma of thus forming a cavity. The most common form of cancer is that com-posed of cylindrical cells. Metastases to other organs in the body arequite common. Bronchial carcinoma is especially prone to give rise tometastasis to the brain (Weller). Sarcomatous growths usually occur in the form of isolated tumorswhich may be single or multiple. Large single growths sometimes attainthe size of an infants head (Fig. 322). Infiltrating growths are lesscommon than with carcinoma. The tumors are usuallj^ somewhat softand of a grayish, whitish or reddish color. Any type of sarcoma may DISEASES OF THE LUNGS 547 be found but the small round-celled variety is the most common. Meta-stasis occurs but is less common than in the case of carcinoma. Otherchanges in the lungs may consist of congestion or aletectasis in the tissueimmediately around the
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