Adenoma. 



3% 



of their tactile sensibility, is an open- question. In some adeno- 

 mata the reverse is apparently the case, the connective tissue 

 proliferation apparently being- the major feature, in its prolifera- 

 tion causing- expansion of the surfaces of the gland lumina and 

 thus ali'ording space for the epithelial gland lining to develop. 

 Both tissues proliferate side by side in mutual interdependence 

 in the production of gland tissue. 



There are as many varieties of adenoma as there are different 

 glands in the animal body, and as the tumor invariably takes its 

 origin from a gland it always represents a histological copy of 

 the particular gland in question. The growth has, too, in all 

 instances the same type of epithelium which characterized the 

 original gland, and the same kind of connective tissue stroma is 



f^ig IIG. 



Adenoma, of size of human head, of the gall ducts iu the liver of cow ; 



(cut surface). 



preserved in more or less precise simulation of the structure 

 peculiar to the parent gland. Corresponding to the dififerent 

 glands these tumors may be divided into major types of tiihular, 

 alveolar and follicular adenomata; and depending upon their 

 origin it is customary to speak of them as sweat-gland, seba- 

 ceous, hepatic, salivary, .renal and other adenomata. 



In this pathological proliferation of the glandular tissue there 

 occur, how^ever, manifold modifications and abnormal features. 

 The epithelium, although generally exhibiting the same structure 

 and even secretory function as the original type, is often increased 



