138 POULTRY DISEASES 



which the tumors involved the ovary, intestines, 

 peritoneum (lining of the abdominal cavity) and 

 the liver. These tumors vary in size, are whitish- 

 yellow, and soft when sectioned. 



Adenoma 



An adenoma is a tumor that has some resem- 

 blance to a normal gland. It is made up of con- 

 nective tissue and asini, or cavities, lined by col- 

 umnar or cuboidal cells. One tumor of this type 

 affecting the spleen of a hen was sent to the labora- 

 tory. The spleen was about twice normal size. 



Lymphosarcoma 



This is a malignant type of tumor. One case, 

 affecting the heart of a chicken was sent to the 

 laboratory. The heart was about normal size, 

 and when cut showed small, roundish, clear areas. 

 These proved to be small tumors that come un- 

 der this heading. 



Epithelioma 



This is a type of cancer. One hen was brought 

 to the laboratory with the history that she had a 

 "growth" on the side of the head for several 

 months. The tumor was flat and about one inch 

 in diameter. A microscopic examination revealed 

 it to be an epithelioma. 



