Peer-reviewed veterinary case report
Bilateral granulosa cell tumor in a cycling mare.
- Journal:
- The Canadian veterinary journal = La revue veterinaire canadienne
- Year:
- 2019
- Authors:
- Castillo, Juan M et al.
- Affiliation:
- Department of Clinical Sciences (Castillo · United States
- Species:
- horse
Plain-English summary
A 16-year-old Oldenburg mare was brought in because she was acting like a stallion. She had previously given birth to two foals. A physical exam showed that both of her ovaries were enlarged, and an ultrasound revealed a large cyst on one ovary along with small follicles that looked like a honeycomb. Blood tests showed high levels of a hormone that indicated she had a granulosa cell tumor (a type of tumor affecting the ovaries). The veterinarians surgically removed both ovaries, and tests confirmed the presence of tumors in both. The treatment was successful in addressing the tumors.
Abstract
A 16-year-old Oldenburg mare was evaluated for stallion-like behavior. The mare had given birth to 2 foals previously. Transrectal palpation revealed bilaterally enlarged ovaries with no palpable ovulation fossa. Ultrasound examination showed both ovaries to have small follicles giving a honeycomb appearance, concurrent with a single large cystic structure in the left ovary (10.2 cm diameter). Serum Anti-Müllerian hormone (AMH) was elevated (95.7 pmol/L), consistent with granulosa cell tumor (GCT). Both ovaries were removedflank laparoscopy and were evaluated by histopathology, which confirmed bilateral GCT and concurrent presence of fresh luteal tissue, demonstrating the unusual presentation of bilateral granulosa cell tumor in a cycling mare.
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Search related cases →Original publication: https://pubmed.ncbi.nlm.nih.gov/31080259/