Feline Ovarian Remnant Syndrome – NAVLE Study Guide
Overview and Clinical Importance
Ovarian Remnant Syndrome (ORS) is the presence of functional ovarian tissue in a previously spayed queen (ovariohysterectomized female cat). This condition is more commonly reported in cats than dogs due to feline anatomical considerations, including the difficulty in breaking down the proper ligament of the ovary and challenges in exteriorizing the ovary during spay surgery. ORS is a high-yield NAVLE topic because it tests knowledge of feline reproductive physiology, surgical complications, and diagnostic reasoning.
The remaining ovarian tissue continues to produce reproductive hormones, resulting in clinical signs of proestrus and estrus in a spayed female. This occurs weeks to years after the original surgery and may lead to significant complications including uterine stump pyometra, mammary neoplasia, or behavior problems.
Etiology and Pathophysiology
Causes of Ovarian Remnant Syndrome
ORS develops from one of three primary mechanisms:
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