GCT - Contralateral Ovary.
Ovary of a mare with a granulosa cell tumor. On palpation the right ovary was very large and very firm, while the left ovary was small and inactive. Ultrasonography of the left ovary revealed a small, inactive ovary with no follicles developing beyond ~ 5 mm. GCTs secrete large quantities of inhibin, which blocks follicular development on the contralateral ovary.
King AC (2008)