390 HISTOLOGY OF THE MORBID PROCESSES. 



ment of the cells is often strikingly shown in secondary tumors of 

 the lung, in which the cells have appropriated the pulmonary alveoli 

 for their stroma. 



It occasionally happens that the connective tissue that forms the 

 stroma of a carcinoma does not progress in its development to the 

 formation of fibrous tissue, but assumes a sarcomatous character. 

 Such tumors are called a carcinoma sarcomatosum." A more fre- 

 quent association is one of carcinoma with adenoma, " adenocar- 

 cinoma " (Fig. 358). In these neoplasms, either the two forms of 



FIG. 359. 





.^W 



Epithelioma of the cheek. (Ernst.) a, delicate tongues of epithelium extending into the 

 lymphatics of the part ; b, c, larger masses of epithelium containing pearl-bodies. 



epithelial tumor may occupy different portions of the growth, or 

 the general character of the growth may be that of a rather typical 

 carcinoma i. e., a carcinoma showing indications of a development 

 beyond the undiiferentiated state analogous to an embryonic gland 

 or that of a rather atypical adenoma. 



