108 PBINCIPLES OF VETEKINABT SUBeSKT 



Epithelial Neoformations— Epiblastie and 

 Hypoblastic Tumors. 



CAKCINOMA. 



What is a carcinoma ? 



A malignant tumor growing from epithelial surfaces, 

 having its epithelial cells clustered in nests (alveoli) bounded 

 by fibrous tissue. 

 Are carcinomata found in non-epithelial tissue ? 



They are ; but in these cases they are secondary (meta- 

 static). 



What do you understand hy cancerous cachexia 9 



This, also termed carcinomatosis, represents a nutritiv& 

 disturbance, a generalized chronic sepsis, a sort of auto- 

 intoxication, most likely due to the absorption and diffusion, 

 of secondary products originating from the carcinoma. 



What forms of carcinomata are recognized ? 



1. The squamous-celled epithelioma. 



2. The cylindrical or columnar celled epithelioma. 



3. The acinous or spheroidal celled carcinoma. 

 Subdivided into : 



(a) Hard or scirrhous cancer. 



(b) Soft or encephaloid cancer. 



Describe the squamous-celled epithelioma. 



It springs from the skin or mucous membranes ; in other 

 words, from free epithelium-clad surfaces, especially at the 

 junction of cutaneous and mucous surfaces. It is composed of 

 flattened cells, surrounded by a fibrous stroma ; such a nest of 

 cells is called epidermic pearls or cell nests. It begins usually 

 as a wart-like growth or fissure, ulcerating early. On section. 



