Segmental eosinophilic colitis leading to pelvic flexure impaction in a Quarter horse

A fifteen-year-old Quarter horse gelding presented for a 48 hour history of colic which was unresponsive to appropriate medical management. At presentation, the patient was quiet but alert and was in significant abdominal discomfort. Physical exam findings were consistent with pelvic flexure impaction and point of care blood work was unremarkable. Peritoneal fluid analysis supported a non-infectious, mixed inflammatory process. Surgical intervention was elected due to worsening abdominal pain that was refractory to medical management. A transmural mass at the junction of the pelvic flexure and left dorsal colon causing a partial obstruction and resulting in an impacted left ventral colon was identified. A wedge resection and anastomosis was performed to remove the mass. Histopathology results were consistent with segmental eosinophilic colitis. Inflammation extended to all surgical margins and no underlying etiology was identified.