Variações anatômicas relacionadas ao sistema biliar extra-hepático em Canis lúpus familiaris : estudo preliminar

Abstract

Domestic dogs (Canis lupus familiaris) may present anatomical variations of the extrahepatic system (hepatic ducts, cystic duct and common bile duct); such anatomical changes directly interfere with the choice of surgical technique related to pre-existing pathology in the canine extrahepatic system. The objective of this study is to detail anatomical aspects of the extrahepatic conformation and ramifications of the hepatic ducts, focusing on the determination of an average between the samples and the size of the cystic duct (D-cis). Forty-one livers of mongrel dogs, over 12 months of age, weighing from 1 to 30 kg, with no history of liver injury, submitted to euthanasia or natural death, were evaluated, analyzing the length and width (cm) of the gallbladder ( Vb), cystic duct, common duct (D-Com), and lobar patterns of the biliary tree. For this evaluation, radiographic dye was injected, followed by a resin and etching technique, making it possible to visualize the structures of the biliary tree radiographically and macroscopically. Distinct anatomical conformations and sizes of D-cis, D-com and Vb were observed, presenting weight versus C-Cis data that reflect a linear behavior. Through data analysis, it can be seen that weight versus C-Cis reflect a linear behavior with r2 = 92.32%, making it possible to estimate a suggestive length according to the patient's weight, thus reducing the post-surgical risk of associated cholecystectomies spillage of bile into cavity. This study proposes a way to estimate the length of the cystic duct of an animal using only its weight.