Chronic eosinophilic pancreatitis and ulcerative colitis in a horse.

This research was conducted on a horse suffering from a debilitating disease believed to be related to an allergic reaction to migrating strongyle larvae. The study discovered severe signs of chronic multifocal eosinophilic pancreatitis, hepatic portal fibrosis, biliary hyperplasia, and chronic ulcerative eosinophilic colitis, which resulted in the horse’s condition worsening leading to euthanasia.

Background and Case Overview

• The research focused on a case involving a horse suffering from a generalized debilitating disease. The horse showed clinical signs such as weight loss, diarrhea, and ulcers on all four coronary bands. The medical team hypothesized the condition was linked to a hypersensitivity response to migrating strongyle larvae.
• The mare’s condition progressively deteriorated, pushing the team to euthanize and subsequently conduct a necropsy for more detailed examination.

Medical Findings

• The necropsy revealed several important findings in relation to the condition of the horse. These included chronic multifocal eosinophilic pancreatitis, hepatic portal fibrosis, biliary hyperplasia, and chronic ulcerative eosinophilic colitis. Each of these conditions contributed towards the horse’s poor health condition and necessitated euthanasia.
• The pancreatitis, identified by a chronic inflammation characterized by the presence of eosinophils, a type of white blood cell, affected multiple areas of the pancreas.
• The hepatic portal fibrosis, which represented a condition where fibrous tissue excessively grows in the liver’s portal vein, caused liver degradation. Concurrently, the biliary hyperplasia, an unusual increase in bile duct numbers, showed an abnormal liver condition.
• The chronic ulcerative eosinophilic colitis, marked by ulcerative inflammation in the colon filled with eosinophils, resulted in the observed symptom, diarrhea.

Comparison to Previous Cases and Conclusions

• Although the horse’s disease was unique, it was found to be similar to previously reported cases of chronic eosinophilic gastroenteritis in horses, a chronic inflammatory disorder characterized by eosinophilic infiltration in any part of the gastrointestinal tract.
• The research team could not identify the exact etiologic agent, but the distribution and nature of the lesions were consistent with a hypersensitivity response to migrating parasitic larvae, most probably Strongylus equinus, reinforcing their initial hypothesis.