Two Canine Cases of Vaginal Dilatation due to Gynatresia Congenitalis

Abstract

The first case was found in a Shih Tzu dog 6years and 7 months old with abdominal dilatation and disturbances in urination and defecation. It revealed hypoplasia or agenesis of the vagina at the vestibulo-vaginal junction, a prominent expansion of the vagina containing a large amount of fluid and a mild degree of cystic endometrial hyperplasia of the uterus by laparotomy. From these findings, this case was diagnosed as vaginal dilatation due to atresia vaginalis with hypoplasia of the vestibulo-vaginal junction or caudal vaginal agenesis in gynatresia congenitalis.
The second case was a nulliparous mongrel bith 6 years and 3 months old which had undergone ovariohysterectomy in immature day. She demonstrated similar clinical signs to those of the first case. Exploratory laparotomy revealed two large lumps occupying almost the entire abdominal cavity, the remaining left ovary, and the persisting whole hymen without both uterine horns. From these results, the same diagnosis was made as in the first case. It was presumed that estrous secretions from the reserved left ovary mignt have accumulated in the vagina and the remaining portion of the uterine body.
Canine vaginal dilatation due to gynatresia congenitalis is rare. Few reports on it can be seen especially in Japan.