300 



PATHOLOGY OF NUTRITION. 



villi of the intestines, and surmounted by epithelium. It may 

 be a simple, smooth elevation, or have a cauliflower appear- 

 ance (Fig. 129). They occur especially in the bladder, gastro- 

 intestinal tract, larynx, and nose. 



An adenoma, as its name implies, is a tumor which, histo- 

 logically, more or less closely resembles normal, tubular, or 

 acinous glandular structures (Fig. 130). The absence of 



FIG. 130. 



Adenoma of mamma, a, acini ; 6, ducts ; c, well-marked connective-tissue stroma. 



X 30 (Ziegler). 



excretory ducts often leads to cystic dilatation of the tubules 

 or acini, from the accumulation of the secretions of the 

 glandular elements, giving rise to the term cysto-adenoma. 

 From the walls of such cysts papillary outgrowths may 

 occur. 



Adenomata are benign, though in some cases there may be 

 metastasis. Their most frequent situations are the skin, mu- 

 cous membranes, mammae, kidneys, ovaries, liver, thyroid, and 

 prostate gland. In the ovaries they are supposed to be the 

 origin of ovarian cysts, which often reach an enormous size. 



