540 



PRINCIPLES OF VETERINARY SURGERY 



into cavies. Ablation proved it to be a gland infiltrated with 

 pig-ment. Dexter observed melanosis in the cardiac glands. 

 The bronchial, the mediastinal and the mesenteric glands 

 may also be invaded and transformed into enormous masses. 

 5. Viscera. — The viscera are seldom spared. The spleen 



Fig. 62. 

 Melanosis of the Omentum. 



is often encroached upon with melanosis, either simple mel- 

 anosis or melanotic tumors. The former are of the typical 

 form already described. (Fig. 63). Melanotic tumors, and 

 particularly the sarcomatous variety, have been observed. 

 Their weight may reach 25 kilograms (Gregory) or even 33 

 kilograms (Nibbert). The surface and the edges are strewn 



