Biliary disorders in horses warrant closer attention in chronic cases

Biliary disorders in horses, particularly cholangiohepatitis, remain a clinically important but relatively uncommon cause of equine liver disease, according to a review by Simon F. Peek and Kimberley Sebastian in Veterinary Clinics of North America: Equine Practice. The review focuses on adult horses and highlights that cholangiohepatitis is often accompanied by intrahepatic or extrahepatic biliary obstruction caused by thickened “sludgy” bile or by choleliths. In horses, those stones are typically composed of calcium bilirubinate rather than cholesterol, and the condition can become recurrent and chronic, shaping both treatment decisions and long-term case management. Supporting references note that horses are anatomically distinct because they lack a gallbladder, and that biliary obstruction may be silent in some cases or present with weight loss, fever, depression, jaundice, colic, and abnormal liver enzymes, especially marked increases in GGT. (merckvetmanual.com)

Why it matters: For veterinary professionals, the review is a reminder that biliary disease should stay on the differential list when adult horses present with vague systemic illness, recurrent colic, pyrexia, icterus, or biochemical evidence of cholestasis. Diagnosis may require a combination of clinicopathologic testing, ultrasonography, and liver biopsy, and prognosis depends less on enzyme elevation alone than on liver function, fibrosis, and whether obstruction or infection can be controlled. Available literature also suggests that some horses need prolonged medical management, while others with obstructive choleliths or choledocholiths may require surgical intervention. (merckvetmanual.com)

What to watch: Expect continued attention on earlier recognition, better differentiation of biliary versus other hepatic disease, and how clinicians manage chronic or recurrent cases in the field and referral setting. (pmc.ncbi.nlm.nih.gov)