i/_ VETERIMARV PATHOLOGY. 



mav develop from glandular or surface epithelium, which, in 

 the attempt to repair the eroded surface, becomes entangled in 

 the ragged edges of the ulcers and develop as an epithelioma. 



The cell nests increase in size by a multiplication of the peri- 

 pheral cpitlielial cells. The rapidly multi]3lying marginal cells 







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FiR-. L'o.",. — M icrnsc'.pir s<ction of K|>ithelionia <'onlasi«isuiii 

 1. Surfacf of growth from nasal mucous mem.branr. 

 2.. Area of <-i-)ithel Jal c.'lls. c<-lls targe in center, b. -coming smailc 



blending with the connective tissue. 



3. Apparently connective tissue unflergoing mucoid degeneration. 



4. Probably blood vessels, but the cells are smaller than normal red blood 



of the chicken. The cells are also quite irregular in shape. 



5. Degeneration of central cells. The nucleus of the cell first degen^rateM 



finally the cell body. 



and finally 



cells 

 and 



consume practically all of the central cells and there is central 

 necrosis f)f the cell nests. 



The nests are irreo^ular in size and outline and they are 

 grotiped to form the nodules. The nodules may or may not 

 have bands of clear, hyaline substance that represents fibrous 

 tissue undergoins^ hyaline or mucoid degeneration. 



