Surgical Management of Feline Ovarian Remnant Syndrome

When “Spayed” Still Had a Secret

A previous spay should eliminate ovarian hormonal activity—but in rare cases, a small amount of functional ovarian tissue may remain inside the abdomen.

This cat was brought to AVCI because of persistent vaginal discharge despite having been spayed previously. Since post-spay discharge is not considered normal, diagnostic imaging was performed to investigate the possible source.

Radiographs provided an initial abdominal assessment, while ultrasonography revealed a structure suspicious for retained ovarian tissue. Ovarian remnant syndrome occurs when functional ovarian tissue remains after a previous spay and continues to produce reproductive hormones.

Depending on the patient, retained ovarian tissue may cause:

• Recurring signs of heat
• Attraction of male cats
• Vocalization or behavioral changes
• Vulvar swelling or vaginal discharge
• Hormonal stimulation of remaining uterine tissue
• Increased risk of inflammation or infection in retained reproductive structures

Exploratory surgery was performed to directly examine the reproductive tract. The procedure confirmed retained active ovarian tissue together with an enlarged remaining uterine body. Both abnormal tissues were surgically removed.

The patient recovered well following surgery and postoperative monitoring.

Diagnosing ovarian remnant syndrome may require a combination of clinical history, reproductive signs, hormonal evaluation, diagnostic imaging, and surgical exploration. Small remnants can be difficult to identify, particularly when the tissue is not hormonally active at the time of examination.

This case highlights that persistent or recurring reproductive signs after a spay should not be ignored. Routine procedures still require complete removal of the intended reproductive tissues, careful surgical technique, and appropriate follow-up when unexpected signs develop.

Notice vaginal discharge, heat-like behavior, vulvar swelling, or attraction of male cats after your pet has already been spayed? Visit AVCI for proper evaluation.