Peer-reviewed veterinary case report
Granulosa-theca cell tumor associated with an ovulation fossa and normal ovarian stroma in a mare.
- Journal:
- Journal of the American Veterinary Medical Association
- Year:
- 1992
- Authors:
- Hinrichs, K et al.
- Affiliation:
- Department of Medicine · United States
- Species:
- horse
Plain-English summary
A mare had a tumor in one of her ovaries, which was causing her ovary to appear larger and led to some changes in her behavior. Before surgery, an ultrasound showed that the ovary looked unusual, but during the operation, the vet found that the ovary was mostly normal in size, with a small enlargement on one side and an ovulation fossa (a normal part of the ovary). The vet also noticed some atrophy (shrinkage) of a part of the ovary, which helped confirm the diagnosis of the tumor. After the surgery, the mare's testosterone levels were normal, and the tumor was successfully removed.
Abstract
A granulosa-theca cell tumor was found in an ovary that had an ovulation fossa and normal ovarian tissue. The ovary was removed from a mare with a history of ovarian enlargement and behavioral changes. The affected ovary had a multicystic appearance on ultrasonographic examination performed before surgery, and an ovulation fossa was not palpable on examination per rectum. However, during surgery, the affected ovary was found to be within normal size limits, with an enlargement on 1 pole, and to contain an ovulation fossa. Atrophy of the infundibulum of the affected ovary helped to confirm the diagnosis of granulosa-theca cell tumor, and the ovary was removed. The mare's testosterone concentrations were normal. Granulosa-theca cell tumors are usually associated with a spherical ovary, attributable to ablation of the ovulation fossa, with no normal ovarian tissue present.
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Search related cases →Original publication: https://pubmed.ncbi.nlm.nih.gov/1314794/