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Hydrosalpynx in a dog secondary to incomplete ovariohysterectomy[1]

Hydrosalpynx are a relatively common benign neoplasm of the canine ovary characterized by a distally blocked fallopian tube filled with serous or clear fluid.

These fluid-filled cysts can result from chronic ovarian inflammation (a blood-filled tube (hematosalpynx) or pus (pyosalpynx)), segmental aplasia or neoplasia.

These cysts may occur unilaterally or bilaterally, can result in infertility and are commonly mistaken for ovarian cysts[2].

The most common cause of hydrosalpynx is obstruction of the uterine tube from incomplete ovariohysterectomy (ovarian remnant syndrome)[3].

A presumptive diagnosis can be made on abdominal ultrasonography and supportive blood tests for detection of estradiol concentration. Estradiol levels of > 20 pg/mL can be considered as evidence of ovarian remnant syndrome or ovarian tumor.

A definitive diagnosis is made by exploratory laparotomy and histological confirmation of the presence of ovarian structures in conjunction with resolution of the signs[4].

A differential diagnosis would include granulosa cell tumor[5], teratoma[6] or luteoma.


  1. University of Guelph
  2. Akihara Y et al (2007) Immunohistochemical evaluation of canine ovarian cysts. J Vet Med Sci 69(10):1033-1037
  3. Sontas BH et al (2011) A huge ovarian cyst in a hysterectomized bitch. Reprod Domest Anim 46(6):1107-1111
  4. Sangster C (2005) Ovarian remnant syndrome in a 5-year-old bitch. Can Vet J 46(1):62-64
  5. Kim H et al (2012) A giant parovarian cyst in a dog with a granulosa cell tumor. J Vet Med Sci 74(3):385-389
  6. Rota A et al (2012) Monophasic Teratoma of the Ovarian Remnant in a Bitch. Reprod Domest Anim Dec 24