TUMORS 113 



What anatomical structures most commonly exhibit carcinoma? 



In the horse : Mammary gland, kidneys, testicles, facial 

 bones, ovaries, stomacli, penis, retropharyngeal glands, 

 spermatic cord, epiglottis. 



In the dog : Skin, mammary gland, anus, prostate, 

 testicles, vagina, penis, thyroid. In this animal cancerous 

 cachexia is not an infrequent occurrence. 



How rapidly do carcinomata develop ? 



The proliferation may persist for months or years ; the 

 primary hard tumor develops slowly. 



How does the frequency of sarcomata compare with that of 

 carcino'mata 9 

 Carcinomata are not as often seen as sarcomata. 



Generally speaking, which parts exhibit carcinomata ofienest ? 

 Sexual organs, mammary gland and thyroid. 



Describe the carcinoma of the shin. 



Most frequently seen in the dog on the ears, eyelids, 

 prepuce, scrotum ; on the 'tail and back, anus and lower 

 extremities. In the horse : the tail, prepuce, penis. 



The skin cancer may be circumscribed or diffused, 

 infiltrates the surrounding tissues and leads to ulceration of 

 the skin. It is usually hard, of irregular surface, has 

 secondary nodules in the surrounding parts and secondary 

 swelling of the regional lymph glands. Those about the 

 penis are usually of large size and of ragged appearance. 



Describe the carcinomata of the rnucous membrane. 



In the horse those in the superior maxillary sinus are firm, 

 lobulated, vascular new-growths, containing a milky fluid, 

 with a tendency to break into the frontal sinus or into the 



