280 



THE MICROSCOPIST. 



b. The lymphatic glandlike round-celled sarcoma exhibits 

 round cells in a delicate network of fibres among wide 

 thin-walled capillaries (Fig. 225). 



There are several varieties of these lymphadenoid sar- 

 comas, as the lipomatous sarcoma, in which the cells by 

 infiltration are transformed into fat; the mucoid sarcoma, 

 from mucoid metamorphosis ; and the large-celled round- 

 celled sarcoma, which seems almost epithelial in its char- 

 acter of cells, with a large-meshed network. This tumor 

 is soft and brainlike, and may be easily confounded w r ith 

 the following: 



c. The Alveolar Round-celled Sarcoma. This has a great 

 resemblance to cancer, and has been called sarcoma carci- 

 nomatodes. It consists of groups of cells not connected 



FIG 226. 



Alveolar round-celled sarcoma, pigraented. b. Alveolus from which the ball of round 

 cells has fallen out. c. Vessel with pigmented eridothelia. d. Piginented round cells. 

 e. Spindle cells forming a stroma. After RINDFLEISCH. 



by basis-substance, but held in alveoli or clefts of connec- 

 tive tissue. The cells resemble epithelium. An exceed- 

 ingly malignant variety has been called pigmentary cancer 

 (Fig. 226). 



(2.) Spindle-celled sarcomata are divided into a, small- 

 celled spindle^elled sarcomata (Fig. 227), which resembles 



