TUMORS 89 



iftbromata, osteomata in the bones, neuromata in the nerve 

 tissue, myomata in muscles, etc. 



2. The age is of some importance, as young animals are 

 rarely affected with cancer. Sarcomata and papillomata are 

 more common in the young. 



3. In regard to the size and development, it is to he 

 remembered that, generally speaking, malignant tumors 

 grow quicker and are of larger size than innocent ones. Soft 

 fibromata and sarcomata develop very rapidly, while in the 

 horse sarcomata and botryomycomata attain a large size. Of 

 some importance, also, is the fact whether the tumor is 

 solitary or whether several tumors are present (multiple). 

 To multiple new growths the papilloma and fibroma is in- 

 clined ; while the sarcoma and carcinoma, when becoming 

 generalized, give rise to multiple metastatic tumors. 



i. The surface of tumors permits of some deductions. 

 Thus, the papilloma, fibroma, botryomycoma and carcinoma 

 are nodular or bosselated (lobulated) in the fatty tumor, 

 smooth in the sarcoma. 



5. Consistency. Sarcomata are the softest ones. The 

 lipoma, soft fibroma, myxoma and cysts are also soft. Some 

 types' of fibromata and carcinomata are hard, while enchon- 

 dromata and osteomata are of bony hardness. 



6. Relationship to the adjacent and overlying tissues. 

 Benign tumors, as fibroma, lipoma, papilloma, are usually 

 well defined and movable, no adhesions existing between the 

 tissues in which it originated and the adjacent skin. Sar- 

 comata often invade the deeper tissues, while carcinomata 

 are prone to ulceration. 



7. Regional lymph glands invariably exhibit metastatic 

 swelling in malignant tumors. 



8. Animal species. Gray horses often show melano sar- 



