This is really invagination into the female urethra and bladder. It has
only been seen in mares, and then by reason of the extreme dilatability
of the urethra. A pyriform, red, perhaps rugose tumor shows between the
lips of the vulva, during straining. It is covered by mucosa, and on its
upper surface near to its neck are two small orifices from which urine
oozes or comes in jets during active expulsive efforts. It soon becomes
muco-purulent on the surface, and even excoriated. Urine escaping
continuously trickles down the thighs with much fœtor. It occurs
especially during violent expulsive efforts as in parturition or
constipation.
_Treatment_ essentially surgical consists in uniform compression to
expel blood and exudate followed by the pushing of the fundus through
the bladder and urethra. The more recent the case, the easier is the
process. Pressecq claims to have cured an obstinately recurring case, by
cauterizing the urethra up to the cervix vesicæ with a round iron rod an
inch in diameter. The resulting loss of substance, with the neoplasia
and constriction effectually prevented renewed eversion even during
parturition. Other veterinarians have successfully excised the bladder,
but this entailed incontinence and constant offensive soaking of the
thighs with urine.