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J Am Vet Med Assoc. 1990 Oct 15;197(8):1037-8.

Granulosa cell tumor in a mare with a functional contralateral ovary.

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Department of Medicine, School of Veterinary Medicine, Tufts University, North Grafton, MA 01536.


A functional corpus luteum was found in the ovary contralateral to the ovary with a granulosa cell tumor in a 24-year-old Standardbred mare. The mare was ovariectomized because she was to be used as a jump mare for collection of semen from stallions. The blood concentration of progesterone was 2.2 ng/ml, and the luteal tissue progesterone concentration was 6.3 micrograms/mg. Atrophy of the contralateral ovary is one of the major signs used in diagnosis of granulosa cell tumor; however, our findings indicate that the ovary contralateral to a granulosa cell tumor is not invariably nonfunctional.

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