Ovarian remnant syndrome

G. Robert Weedon, Margaret V. Root Kustritz

Research output: Chapter in Book/Report/Conference proceedingChapter


Ovarian remnant syndrome (ORS) is the presence of functional ovarian tissue in a previously ovariohysterectomized bitch or queen. Reported causes are surgeon error and presence of ectopic or accessory ovarian tissue that becomes functional after removal of the main ovary; presence of such tissue has been reported in humans, cows, and cats and is considered very rare in domestic animals. Diagnostic techniques include vaginal cytology, hormone assays, and imaging techniques. Vaginal cytology is best used when the owner perceives the bitch or queen to be in estrus. Hormones assayed include estrogen, progesterone, luteinizing hormone, and anti-Mullerian hormone. Ultrasonography of the abdomen is described for diagnosis of ORS. ORS can be left untreated, or can be treated medically or surgically. Surgical repair is the treatment of choice. Medical treatment consists of estrus suppression for the life of the animal. All ovarian tissue removed should be submitted for histopathology.

Original languageEnglish (US)
Title of host publicationHigh-Quality, High-Volume Spay and Neuter and Other Shelter Surgeries
Number of pages7
ISBN (Electronic)9781119646006
ISBN (Print)9781118517208
StatePublished - Jan 1 2019

Bibliographical note

Publisher Copyright:
© 2020 John Wiley & Sons, Inc.


  • Estrus suppression
  • Histopathology
  • Hormone assays
  • Imaging techniques
  • Ovarian remnant syndrome
  • Ultrasonography
  • Vaginal cytology


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