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Bilateral granulosa cell tumor in a cycling mare
Juan M Castillo1, May P Y Tse1, Jenna C Dockweiler1
1Department of Clinical Sciences (Castillo, Dockweiler, Cheong, Diel de Amorim) and Department of Biomedical Sciences (Tse); College of Veterinary Medicine, Cornell University, 930 Campus Road, Ithaca, New York 14853, USA.
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 removed via flank 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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