[Enlarged ovary in a mare: review of the literature and a case report].

This research paper deals with the phenomenon of enlarged ovary in mares, usually resulting from underlying conditions such as haematomas, anovulatory follicles, abscesses, or neoplasia. The paper discusses the most common type of neoplasia, granulosa-theca-cell tumour, using a case example of an enormous tumour in a mare discovered after the birth of a healthy foal.

Understanding Enlarged Ovaries in Mares

• The article provides a comprehensive understanding of enlarged ovaries in mares, a common occurrence caused primarily by four medical conditions including haematomas, anovulatory follicles, abscesses, or neoplasia.
• The paper underscores the significance of diagnosing an enlarged ovary correctly to determine the underlying condition and adopt suitable measures for treatment.

Focus on Granulosa-theca-cell Tumour

• Special attention is given to granulosa-theca-cell tumours, accounting for about 97% of all ovarian neoplasias and 2.5% of all equine tumours.
• As the most prevalent type of ovarian neoplasia, understanding granulosa-theca-cell tumours’ characteristics is essential for clinicians dealing with reproductive health in mares.

Case Study

• The research discusses a special case of a mare with a large (60cm diameter) granulosa-theca-cell tumour in the left ovary, discovered one month after she delivered a healthy foal.
• The case is notable for two reasons: firstly, because the size of the tumour is exceptionally large, and secondly, because despite the presence of the tumour, the right ovary remained functional and there were no behavioural changes in the mare.
• The existence of a haematoma found two years prior to this discovery added complexity to the diagnosis, pointing out the challenges in differentiating between medical conditions based on ovarian size.

Implications

• This report demonstrates the importance of consistent monitoring and prudent interpretation of ovarian size in mares.
• It also highlights the need to keep various differential diagnoses in mind, considering the ambiguity and overlap of symptoms among different underlying conditions causing ovarian enlargement.