Choledocholithiasis attributable to a foreign body in a horse.

The research article discusses a case where a foreign object, specifically a wooden stick, caused the formation of a bile stone (cholelith), obstructing the bile duct in a horse. This condition, known as choledocholithiasis, led to persistent abdominal pain, jaundice and fever in the horse, and was ultimately diagnosed using ultrasonography.

Background

• Cholelithiasis refers to the formation of gallstones or bile stones in the gall bladder or bile ducts. In horses, this condition is a common cause of blockage in the bile ducts.
• The formation of these stones is often attributed to several mechanisms, including ascariasis (a parasitic infection), biliary stasis (poor flow of bile), ascending biliary infection, and changes in the composition of bile.

Case Presentation

• In this specific case, the research describes how a foreign body, a 7-cm wooden stick, became the core or nidus around which a cholelith formed in the horse’s common bile duct.
• The foreign body induced an increase in bile-salt deposition and infection in the bile ducts (ascending cholangitis) which stimulated stone formation.

Diagnosis

• The horse presented various clinical signs such as intermittent abdominal pain, icterus (yellowing of skin, mucous membranes, and body fluids due to excessive bilirubin in the blood), and pyrexia (fever). These symptoms, along with elevated serum activity of enzymes typically indicative of obstructions in the bile ducts, led to a preliminary diagnosis of cholelithiasis.
• The presence of cholelithiasis was confirmed using ultrasonography, a non-invasive imaging technique that uses sound waves to produce images of the internal organs.

Postmortem Findings

• A postmortem examination of the horse illustrated the root cause. The wooden stick, which was discovered to be the core of the cholelith, had caused the blockage in the common bile duct.