Benign Tumors of the Female Genitalia 



259 



3. Cystic degeneration of the corpus luteum. 



4. Large, single, thick-walled cysts which may reach an 

 indefinite volume and are of unknown origin. 



The fourth type described commonly bars functional ac- 

 tivity in the involved organ, but does not interfere with the 

 reproductive powers of the other gland. The chief interest 

 in such cysts is their volume and their power, in common 

 with par-ovarian cysts, to cause incarceration of the intes- 



Fig. 72— Parovarian Tumor of Mare, Incarcerating Rectum. 



View from right side with the tumor, T, almost hidden by the 



constriction caused by the pedicle. 



Lettering same as Fig. 74 



tines. The diagnosis of large ovarian or par-ovarian cysts 

 must, as a rule, be tentative only. One large and somewhat 

 cystic, malignant, ovarian neoplasm in a cow was diagnosed 

 by a colleague as an "abscess in the uterine ligament". I 

 diagnosed it as a large ovarian cyst. This also was erro- 

 neous. It was indeed somewhat cystic, but the error would 

 have been very important had an attempt been made to rup- 

 ture or puncture the malignant growth within the peritoneal 



