396 Diseases of the Genital Organs 



pregnant cows, but not of the nymphomaniac type. The 

 cysts of nymphomania develop at times when physiologically 

 the animal should ovulate. That is, she has reached breed- 

 ing age and is not at the time pregnant. No corpora lutea 

 are present to exclude estrum. There are no recognizable 

 lesions in the genital tract or elsewhere which would tend to 

 inhibit estrum, except the nymphomaniac cysts themselves. 

 It appears justifiable, therefore, to believe that the nympho- 

 maniac cyst is a pathologic process occurring in an ovisac 

 which is nearing maturity. 



The cysts of nymphomania are exceedingly variable in 

 size. They are rarely less than one inch, and with equal 

 rarity exceed three inches in diameter. When larger cysts 

 appear, like those desiribed on page 257, nymphomania is 

 not present, and as a rule the cyst inhibits fertility upon the 

 involved side only, while the other ovary functions and the 

 animal breeds. When the cyst of nymphomania is present, 

 however, fertility is in abeyance. 



The number of nymphomaniac cysts which may simulta- 

 neously exist varies from one to three or four. The pres- 

 ence of one nymphomaniac cyst does not prevent, nor tend 

 to prevent, the formation of others. The cysts are multiple, 

 not multilocular. That is, each cyst arises separately, so 

 far as can now be determined, from individual ovisacs, and 

 remains distinct throughout its existence. Hence one ovary 

 may have two or three contiguous, nymphomaniac cysts. 

 The cysts frequently involve both ovaries, although some- 

 what frequently only one is affected. However, the sterility 

 is as complete with only one ovary involved as when the dis- 

 ease is bilateral. 



There is wide variation in the thickness of the cyst walls. 

 In some cases they burst upon very slight digital pressure 

 when being examined per rectum. As a general rule, they 

 require moderate pressure before they are ruptured. In a 

 majority of eases, the cyst wall is so dense that it is unsafe 

 to rupture it by rectal pressure and it requires in some in- 

 stances all the force the operator can command to rupture 

 it through the vagina. In rare cases, the cysts can not be 



