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Updated: Aug 12, 2025

Extrahepatic Bile Duct and Gall Bladder Dissection in Nine-Day-Old Mouse Neonates

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Published on: August 23, 2022

Biliary parascarosis in a foal.

Alireza Sazmand¹, Morteza Yavari², Mohammad Babaei²

¹Department of Pathobiology, Faculty of Veterinary Science, Bu-Ali Sina University, Hamedan, Iran.

Veterinary Medicine and Science

|February 1, 2023

Summary

A Parascaris worm was found in the bile ducts of a deceased filly, suggesting ante-mortem migration into the equine liver. This highlights the importance of considering Parascaris infection in diagnosing equine liver and pancreatic issues.

Keywords:

Nerium Parascaris aberrant parasite migration equine oleander

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Area of Science:

Veterinary Parasitology
Equine Medicine
Hepatobiliary Pathology

Background:

Ascariasis, the migration of Ascaris worms, is a known phenomenon in humans and other animals, affecting organs like the liver and biliary tree.
Previous studies have documented Ascaris suum and Toxocara vitulorum in the livers of swine and buffalo, respectively.

Observation:

An 8-cm adult male Parascaris was discovered at the junction of the lobar-left hepatic bile duct in a 6-month-old Persian Kurdish filly.
The filly's death was attributed to oleander (Nerium oleander) intoxication.

Findings:

The anatomical location of the parasite within the hepatic bile duct suggests anterior entry via the duodenum and major duodenal papilla.
Given the short post-mortem interval (4 hours) and the distance from the entry point, the migration into the biliary tree is presumed to have occurred ante-mortem.

Implications:

This case underscores the potential for Parascaris infection to cause hepatic and pancreatic dysfunction in horses.
Veterinarians should include Parascaris infection in the differential diagnosis for horses presenting with signs of liver or pancreatic disease.