8 MASS. EXPERIMENT STATION BULLETIN 308 



Lymphocytomatosis 



A stiid\ t)f iinconipHcated 1\ niphocxtomatosis revealed that visceral organs, 

 such as the o\ar\ . mesentery, kidne>', liver, and spleen were most commonly 

 involved. These organs are closeK' associated with serous membranes. Next to 

 be affected were organs and surfaces lined with mucous membranes, such as the 

 peritoneum, oviduct, proventriculus, lungs, pleura, intestine, crop, ureter, and 

 cloaca. Muscle tissue, skin, and ductless glands were involved in a few instances, 

 showing that no tissue of the fowl is entirely resistant to lymphocytomatosis. 



The lymphoc>toma develops the same as the neurolymphoma, except that it is 

 confined almost entirely to tissues other than the nervous type. The invading 

 cell is indistinguishable from the pathological cell occurring in neurolymphomatosis. 

 Parenchymatous organs, mucous membranes, and glandular tissues offer less 

 resistance to invasion than muscle, or the integument. 



Studies on the location of hmphoc\tomas are recorded in Table 2. 



Table 2. The Location of Lymphocytomas 



This table shows that the ovar\ , mesentery, kidney, liver, peritoneum, and 

 glandular portion of the proventriculus are especially susceptible to l\mphoc\ to- 

 matosis. The disease is most conuiion at the age of laying the first egg, which 

 indicates that if irritation is not the sole cause it is at least a contributing factor. 



