162 SWINE DISEASES 



in size from that of a dime to a fifty-cent piece, are grayish- 

 white in color, and usually have a raised border and de- 

 pressed center. There may be only one or two of these 

 necrotic foci, or the spleen may be full of them. 



Hypertrophy 



Hypertrophy of the spleen is rather common. The 

 condition occurs in leukemia, tumor formation, and in 

 swine that are fed excessively. 



Tumors 



Sarcomatosis is a relatively common condition in the 

 spleen. The*majority of the cases observed were primary, 

 but secondary splenic sarcomas do occur. The tumor is 

 usually multiple, the foci varying in size from mere points 

 up to masses as large as a hen's egg. The centers are 

 white or grayish-white in color, and are rather firm. 

 They are usually circumscribed with a thin, fibrous 

 capsule. 



