[Clinical aspects of ovary tumors in mares].

The research focused on investigating the clinical aspects of ovary tumors in mares, particularly those with a permanent unilateral enlargement. The study noted that most mares did not foal until two years after tumor removal surgery.

Study Design

• The study investigated a sample of 31 mares that had a permanent unilateral enlargement of the ovary.
• 29 out of these 31 mares had their affected ovaries surgically removed in a standing position laparotomy.
• The surgically removed ovaries were then submitted for histopathological examination to determine the nature of the tumors.

Findings

• The histopathological analysis revealed granulosa cell tumors in 23 cases, fibroma in two cases, and a single case each of teratoma, hematoma, leiomyoma, and a cystic ovary.
• Granulosa cell tumors were described as having endocrine activity, which resulted in changed behavior in the mares and atrophy of the ovary right opposite to the affected one.
• The researchers noted that the clinical presentation of ovarian blastomas (teratoma, leiomyoma, fibroma) could not be clinically differentiated from granulosa cell tumors.

Postoperative Prognosis

• The study reported a good prognosis of fertility following the surgery to remove the ovarian tumors.
• However, the research highlighted that most of the mares did not foal until two years post-surgery.

Implications

• This research contributes to the understanding of ovary tumors in mares, shedding light on their histopathologic types and what one can expect in terms of reproductive viability post-ovariectomy.
• In addition, the study revealed the difficulty in clinically differentiating between various types of ovarian tumors, highlighting the importance of histopathological examination in reaching a definitive diagnosis.