4o6 



Tumors. 



cell infiltration, a true inflammatory infiltration; and the wandering 

 cells may be found penetrating even into the epithelial plugs. 



In cylindrical cell cancers the cylindrical epithelium, extending 

 in its proliferation into the deeper tissues, laterally and, together 

 with its connective tissue, also superficially, usually forms gland- 

 like tubes which branch out in different directions as narrow or 

 wide hollow oft'shoots. The proliferating columnar cells may re- 



Fig. 123. 

 Microscopic section of a siiiiamous epithelioma of glans penis of liorse. 



main in a single layer or become stratified, in the latter case under- 

 going various changes in shape corresponding with the prevailing 

 pressure conditions, goblet cells peculiar to the mucous membrane 

 often being met in great numbers. 



Glandular cell cancers, as far as the morphology of their cells 

 is concerned, are as varied as the types of cells in the different 

 glands of the body. As in adenomata, in these growths the specific 

 gland tissue repeats itself in tumor form. The retention of the 



