378 HISTOLOGY OF THE MORBID PROCESSES. 



Part of this epithelium is, therefore, that which may be said to line 

 the dilated acini ; the rest, that which covers the fibrous tissue 

 which has grown into the acini and caused contact of the epithe- 

 lial layers with obliteration of the lumina. Where the pedicles 

 of these ingrowths are small, sections may contain rings of epithe- 

 lium surrounding an isolated mass of fibrous tissue if the section 

 does not include the pedicle of that particular ingrowth (Fig. 342). 



FIG. 341. 



Adenofibroma of the breast. (Birch-Hirschfeld.) The section shows a tendency toward 

 cystic dilatation of the glandular acini. 



If the tumor is examined macroscopically, the ingrowths may 

 often be lifted from the acini in which they lie. These tumors 

 have received the name " intracanalicular adenofibroma." They 

 must be carefully distinguished from the scirrhous carcinomata of 

 the breast, which, upon superficial examination, they somewhat 

 resemble. 



In examining sections of the breast with a view to determining 



