Canine Ovarian Remnant Syndrome Study Guide
Overview and Clinical Importance
Ovarian remnant syndrome (ORS) is defined as the presence of functional ovarian tissue in a previously ovariohysterectomized (spayed) bitch. This condition results from incomplete removal of one or both ovaries during the original spay procedure, leading to continued production of reproductive hormones and recurrence of estrus signs. ORS is an important differential diagnosis when a spayed female dog presents with signs of heat and represents a recognized complication of ovariohysterectomy (OHE) and ovariectomy (OVE).
The condition is clinically significant because untreated ORS can lead to serious complications including uterine stump pyometra, mammary neoplasia, and ovarian tumors (particularly granulosa cell tumors). Understanding ORS is essential for NAVLE success as it tests knowledge of reproductive physiology, diagnostic endocrinology, and surgical principles.
Etiology and Pathophysiology
Causes of Ovarian Remnant Syndrome
There are three primary mechanisms by which ovarian tissue may remain after spaying:
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