Histopathological features of endometritis eosinophilica in mares.

This research aims to understand and characterize the histological properties of Equine Endometritis Eosinophilica (EE), an uncommonly reported condition in mares. EE was diagnosed in 55 mares, and signs suggest it could be a primary disease reducing fertility. This study further provides a foundation for future research into its pathogenesis, prognosis, and treatment options.

Understanding the Research

Understanding the research requires breaking down the key points covered:

• The researchers intend to characterize the histological features of Equine Endometritis Eosinophilica (EE), a relatively unknown disease in mares. Histology involves studying the microscopic structure of tissues.
• They conducted a search across a database for biopsy cases that showed an increase in eosinophils from 1995 to 2013.
• The diagnosis of EE in horses was based on the criteria for diagnosing EE in women and the physiological number of eosinophils in the horse’s endometrium.
• Eosinophils, a type of white blood cell, play a significant role in fighting off certain infections and participating in allergic reactions. Any abnormal increase may suggest an underlying issue.

Findings

The findings of the study shed light on the properties and impacts of this rare disease:

• A total of 55 mares were diagnosed with EE, 10 of which exhibited eosinophil counts beyond the normal range but did not have EE, these were termed as having eosinophilic infiltrates (EI).
• An irregular glandular differentiation was observed in 25% of the mares with EE, 33% of the mares with EI, and 24% of the mares with normal eosinophil counts, through the breeding season.
• Majority of mares diagnosed with EE (93%), EI (90%), and those with normal eosinophil counts (72%) displayed signs of endometrosis, a degenerative uterine disease occurring in older mares.
• Endometritis, inflammation of the uterine lining, was diagnosed in 56% of mares with EE, 40% of mares with EI, and 37% of those with normal eosinophil count.
• In mares diagnosed with EE, suppurative endometritis (characterized by the presence of pus) was more common (58%), while in those with normal eosinophil count, non-suppurative endometritis (characterized by inflammation without pus) was prevalent (58%).

Implications

This research has important implications:

• It suggests that EE might be a primary factor in reducing fertility in mares.
• There appears to be an association between eosinophilic infiltration and the presence of neutrophils, another type of white blood cell integral in fighting off infections.
• It forms a basis for further investigations into understanding the pathogenesis, prognosis, and potential therapy options for managing EE in mares.