Computed tomographic quantitative evaluation of common bile duct size in normal dogs: A reference range study...

Area of Science:

• Veterinary Radiology
• Biliary System Imaging
• Canine Anatomy

Background:

• Accurate common bile duct (CBD) measurements are crucial for diagnosing biliary disorders in dogs.
• Existing veterinary literature lacks established reference ranges for CBD diameter correlated with body weight (BW).

Purpose of the Study:

• To establish normal reference ranges for CBD diameter across different canine body weight groups.
• To analyze the correlation between CBD diameter and BW in dogs.
• To determine normal reference ranges for the CBD to aorta (CBD: Ao) ratio, which is independent of BW.

Main Methods:

• Computed tomography (CT) was used to measure CBD diameter at three distinct sites (porta hepatis, duodenal papilla, mid-portion).
• Measurements were taken from 283 dogs without hepatobiliary disease, categorized into distinct BW groups.
• The CBD: Ao ratio was calculated at each measurement site.

Main Results:

• Significant differences in CBD diameter were observed across all BW groups at all measured levels.
• A positive linear correlation was found between BW and CBD diameter at each site.
• The CBD: Ao ratio demonstrated no significant variation between different BW groups, with established ranges for each site.

Conclusions:

• Weight-specific reference ranges for canine CBD diameter are necessary due to significant BW-related variations.
• The CBD: Ao ratio provides a standardized, BW-independent metric for evaluating the common bile duct in dogs.