EP1THELIOID NEW-FORMATIONS. 



529 



thelial structure as that which Hannover has called 

 epithelioma, nay, ordinary epithelioma very commonly 

 engenders in itself little pearly globules in an often 

 astonishingly great number. Yet both exhibit very 

 essential points of difference. Never as yet have any 

 pearly tumours been seen which, after existing in one 

 place, recurred in remote places, and behaved like malig- 

 nant tumours ; never did anything else occur than a slight 

 extension and that at an extremely slow rate to the 

 immediate neighborhood of the tumour. In the case of 

 epitheliomata on the other hand, or as they are otherwise 

 called, epithelial cancer or cancroid, we see a very 

 marked malignity, for not only are they liable to recur at 

 their original site, but they also reproduce themselves in 

 distant parts. In many cases nearly all the organs of the 

 body are metastatically filled with masses of cancroid. 



Again, if you attempt to dis- 

 tinguish cancroid growths from 

 real cancer by the epithelial 

 structure of their elements, you 

 will herein too give yourselves 

 trouble in vain. Cancer proper 

 has also elements of an epithelial 

 character, and you need only 

 turn to those parts of the body, 

 where the epithelial cells are 

 irregularly developed, as for ex- 

 ample in the urinary passages 

 (Fig. 15), and you will meet with 

 the same curious bodies, provided 



with large nuclei and nucleoli, which are described as 

 the specific, polymorphous cells of cancer. Cancer, can- 

 croid or epithelioma, pearly tumours or cholesteatoma, nay 



FIG. 142. 



Fig. 142. Various, polymorphous cancer-cells, some of them in a state of fatty 

 degeneration, two with multiplication of nuclei. 300 diameters. 



