Reproductive performance following unilateral ovariectomy for treatment of ovarian tumors in 7 mares
Unilateral ovariectomies were performed on 7 mares under inhalation anesthesia for treatment of ovarian tumors. All mares were evaluated for a 2-year history of infertility; 6 mares showed persistent anestrus while 1 mare showed persistent estrus. The presumptive clinical diagnosis of the tumors was made by rectal palpation and ultrasonographic imaging of the ovaries. The affected ovaries were large, spherical, and hard, and the contralateral ovaries were small and inactive. The flank approach technique was used for all of the mares. All mares were operated on successfully. One of the mares had delayed healing and abscess formation in the incision line. In one postovariectomy mare, the contralateral ovary remained small and inactive; the histopathological diagnosis for the ovarian tumor was fibrothecoma and the mare remained infertile after the ovariectomy. The other 6 mares returned to estrus (average: 154 ± 30 days), were capable of breeding, and exhibited normal behavior after the surgery. These mares were diagnosed histopathologically with ovarian granulosa theca cell tumors (GTCT). These mares were not bred until the next breeding season. After breeding (average time to successful conception: 296 ± 20 days after surgery), these mares became pregnant and gave birth to normal foals uneventfully.
Reproductive performance following unilateral ovariectomy for treatment of ovarian tumors in 7 mares
Unilateral ovariectomies were performed on 7 mares under inhalation anesthesia for treatment of ovarian tumors. All mares were evaluated for a 2-year history of infertility; 6 mares showed persistent anestrus while 1 mare showed persistent estrus. The presumptive clinical diagnosis of the tumors was made by rectal palpation and ultrasonographic imaging of the ovaries. The affected ovaries were large, spherical, and hard, and the contralateral ovaries were small and inactive. The flank approach technique was used for all of the mares. All mares were operated on successfully. One of the mares had delayed healing and abscess formation in the incision line. In one postovariectomy mare, the contralateral ovary remained small and inactive; the histopathological diagnosis for the ovarian tumor was fibrothecoma and the mare remained infertile after the ovariectomy. The other 6 mares returned to estrus (average: 154 ± 30 days), were capable of breeding, and exhibited normal behavior after the surgery. These mares were diagnosed histopathologically with ovarian granulosa theca cell tumors (GTCT). These mares were not bred until the next breeding season. After breeding (average time to successful conception: 296 ± 20 days after surgery), these mares became pregnant and gave birth to normal foals uneventfully.
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- Scott, E.A., Kunze, D.J.: Ovariectomy in the mare: presurgical, surgical and postsurgical considerations. J. Equine Med. Surg., 1977; 1: 5-12.
- Pugh, D.G., Bowen, J.M., Gaughan, E.M.: Equine ovarian tumors. Comp. Cont. Educ. Pract., 1985; 7: 710-716. 3. McIlwraith, C.W., Robertson, J.T.: McIlwraith and Turner’s Equine Surgery: Advanced Techniques. 2nd edn., Williams and Wilkins, Maryland. 1998; 371-376. 4. Okada, I., Nakagawa, S., Takemura, Y., Takenobu, T., Matsuoka, T., Mandai, H., Takemura, T.: Ovarian thecoma associated in the first trimester of pregnancy. J. Obstet. Gynaecol. Res., 2004; 30: 368-371.
- Târcoveanu, E., Niculescu, D., Bradea, C., Dimofte, G., Vasilescu, A., Ferariu, D., Crumpei, F.: Incidence and management of the ovarian fibroma and thecoma. Experience of the first surgical clinic Iaşi. Chirurgia (Bucur.), 2006; 101: 325-330. (article in Romanian with an abstract in English) 6. LeBlanc, M.M., Rose, R.J., Hodgson, D.R.: Reproduction. In: Rose, R.J., Hodgson, D.R., Eds. Manual of Equine Practice. 2nd edn., W.B. Saunders Company, Philadelphia, 2000; 365.
- Frederico, L.M., Gerard, M.P., Pinto, C.R.F., Gradil, C.M.: Bilateral occurrence of granulosa-theca cell tumors in an Arabian mare. Can. Vet. J., 2007; 48: 502-505. 8. Moll, H.D., Slone, D.E., Juzwiak, J.S., Garrett, P.D.: Diagonal- paramedian approach for removal of ovarian tumors in the mare. Vet. Surg., 1987; 16: 456-458. 9. Trotter, G.W., Embertson, R.M.: Surgical diseases of the cranial reproductive tract. In: Auer, J.A., Ed., Equine Surgery. WB Saunders Co., Philadelphia. 1992; 750.
- Hooper, R.N., Taylor, T.S., Varner, D.D., Blanchard, T.L.: Effects of bilateral ovariectomy via colpotomy in mares: 23 cases (1984- 1990). J. Am. Vet. Med. Assoc., 1993; 203: 1043-1046.
- Hanson, C.A., Galuppo, L.D.: Bilateral laparoscopic ovariectomy in standing mares: 22 cases. Vet. Surg., 1999; 28: 106-112.
- Adams, A.B., Fessler, J.F.: Atlas of Equine Surgery. W.B. Saunders Company, Philadelphia. 2000; 246.
- Held, J.P., Blackford, J.: Surgical correction of abnormalities of female reproductive organs. In: Youngquist, R.S., Ed., Current Therapy in Large Animal Theriogenology. WB Saunders Co., Philadelphia. 1997; 206-208.
- Athey, P.A., Malone, R.S.: Sonography of ovarian fibromas/thecomas. J. Ultrasound Med., 1987; 6: 431-436.
- Bazot, M., Ghossain, M.A., Buy, J.N., Deligne, L., Hugol, D., Truc, J.B., Poitout, P., Vadrot, D.: Fibrothecomas of the ovary: CT and US findings. J. Comput. Assist. Tomogr., 1993; 17: 754- 759.
- Williams, L.L., Fleischer, A.C., Jones, H.W.: Transvaginal color Doppler sonography and CA-125 elevation in a patient with ovarian thecoma and ascites. Gynecol. Oncol., 1992; 46: 115- 118.
- LeBlanc, M.M.: Diseases of the ovary. In: Colahan, P.T., Merritt, A.M., Moore, J.N., Mayhew, I.G., Eds., Equine Medicine and Surgery. 5th edn., Mosby Inc., Missouri. 1999; 1157-1159.
- Meagher, D.M., Wheat, J.D., Hughes, J.P., Stabenfeldt, G.H., Harris, B.A.: Granulosa cell tumors in mares: a review of 78 cases. In: Proceedings 23rd Annual Convention of the American Association of Equine Practitioners, Vancouver, British Columbia, 1977; 133-143.