Felis ISSN 2398-2950

Ovarian remnant syndrome

Contributor(s): David Godfrey

Introduction

  • Ovarian remnant syndrome occurs when a female cat that has undergone ovariohysterectomy Ovariohysterectomy comes into estrus Queen in estrus due to persistence of active ovarian tissue somewhere in the body.

Pathogenesis

Etiology

  • Possible causes are:
  • Surgical mistake - either leaving part of a normal ovary in situ or removing only one uterine horn along with one ovary.
  • Abnormal anatomy with ovarian tissue being present, eg more dorsally along the ovarian ligament than expected.
  • Seeding of ovarian tissue somewhere in the abdominal cavity at the time of surgery. Implantation may occur into the omentum or on to the serosal surface of an abdominal organ.

Predisposing factors

General

  • It is possible, although unproven, that performing ovariohysterectomy via the flank rather than midline may be a risk factor.
  • Poor surgical techniques such as making the abdominal incision in the incorrect position for easy access to the ovaries or poor anatomical knowledge of the normal feline reproductive tract are possible risk factors.

Timecourse

  • The return to estrus behavior is usually delayed for weeks to months and even for more than a year after the ovariohysterectomy procedure. This is probably due to it taking time for the hormone concentrations to build up enough to induce the behavioral changes.

Diagnosis

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Treatment

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Outcomes

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Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • DeNardo G A, Becker K, Brown N O et al (2001) Ovarian remnant syndrome - revascularization of free-floating ovarian tissue in the feline abdominal cavity. JAAHA 37 (3), 290-296 PubMed.
  • England G C (1997) Confirmation of ovarian remnant syndrome in the queen using hCG administration. Vet Rec 141 (12), 309-310 PubMed.
  • Shemwell R E & Weed J L (1970) Ovarian remnant syndrome. Obstetrics and Gynecology 36 (2), 299-303 PubMed.
  • Putnam R W (1966) Occurrence of estrus in an ovariohysterectomized cats. Can Vet J (7), 155 PubMed.


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