Small-colon rupture attributable to granulosa cell tumor in a mare.

This research investigates the case of a 10-year-old Quarter Horse mare that suffered from a rupture in the small colon, which was identified as being caused by a large granulosa cell tumor.

Case Description

• The horse in question was a 10-year-old mare belonging to the Quarter Horse breed. The mare had been preliminarily diagnosed with a granulosa cell tumor two months prior to the onset of severe symptoms of abdominal pain, increased heart rate, cyanotic mucus membranes, clinical dehydration, visible abdominal distension, and a significant decrease in white blood cells.

Clinical Findings

• Through rectal palpation and ultrasonography, a large mass was identified within the left ovary, which was suspected to be a granulosa cell tumor.
• Further examination revealed signs of an obstructed small colon, identified by a considerable soft tissue mass and tight band.
• Abdominal fluid analysis led to a diagnosis of septic peritonitis, an inflammation of the peritoneum due to a bacterial infection.

Treatment and Outcome

• An exploratory surgery was conducted which unveiled extensive fecal contamination of the abdominal organs.
• Due to the extreme condition and resultant poor prognosis, the mare was humanely euthanized.

Necropsy Findings

• Post-mortem examination confirmed that the tumor was indeed a granulosa cell tumor. It was found within the left ovary and was responsible for creating a tight banding across the left broad ligament, therefore obstructing and leading to the rupture of the small colon.
• Impaction was noted at the small colon due to the blockage, which led to a subsequent perforation at the level of the broad ligament.

Conclusions

• The research concludes that the granulosa cell tumor located in the left ovary led to severe abdominal conditions in the horse, creating an obstruction in the small colon and subsequently causing its rupture.
• Such situations demonstrate the critical implications of granulosa cell tumors in horses and underline the importance of timely diagnosis and treatment.