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J Am Vet Med Assoc. 1975 Jul 15;167(2):148-51.

Equine granulosa cell tumors.


Unilateral ovariectomy was performed on 3 mares affected with granulosa cell tumors. Tumor fluid in each mare was found to contain estrogen, testosterone, and progesterone. In 2 mares, preoperative blood plasma concentrations of these hormones were comparable to those of a series of clinically normal mares. The other mare, which had a history of aggressive, masculine behavior, had higher testosterone content in the tumor fluid and in the preoperative blood sample. After surgical removal of the tumors, each mare developed follicles and ovulated with the remaining ovary. Each was eventually bred and 2 conceived. The probability of metastasis of these tumors in mares appears uncertain. Data from other species suggests a guarded long-term prognosis may be justified.

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