Clinica Veterinaria dell'Orologio, Sasso Marconi, Bologna, Italy.
Department of Veterinary Sciences, University of Pisa, San Piero a Grado, Pisa, Italy.
Vet Radiol Ultrasound. 2023 May;64(3):448-454. doi: 10.1111/vru.13222. Epub 2023 Feb 9.
Computed tomography (CT) is increasingly being used for the study of gallbladder and bile duct diseases. The first step in interpreting CT findings is understanding the cross-sectional anatomy of the structures involved, but there are no published studies describing the CT features of the divisional bile ducts. In dogs, anatomic studies report two common patterns including three or four divisional bile ducts. The aim of this retrospective, descriptive, anatomical study was to describe the size and pattern of the visible divisional bile ducts, based on their location and extension, using contrast-enhanced CT in a group of Labrador Retrievers without evidence of hepatobiliary diseases. The correlation between the biliary duct number and dimensions, and the visceral fat area percentage (VFA%) was also evaluated. The right lateral divisional duct (RLD) was visualized in four of 40 dogs, the left lateral divisional duct (LLD) in nine of 40 dogs, and in 17 of 40 dogs, both were simultaneously visualized. In 10 of 40 dogs, the RLD and LLD were not highlighted. When visible, the RLD has a median diameter of 0.23 cm and a median length of 0.82 cm. The LLD has a median diameter of 0.23 cm and a median length of 2.72 cm. The median diameter of the common bile duct before and after the insertion of divisional bile ducts was 0.23 and 0.25 cm, respectively. No correlation with the VFA% was found. At least one of the divisional bile ducts could be visualized using contrast-enhanced CT in the majority of sampled dogs (75%) .
计算机断层扫描（CT）越来越多地用于胆囊和胆管疾病的研究。解释 CT 结果的第一步是了解相关结构的横断解剖结构，但目前尚无描述分支胆管 CT 特征的已发表研究。在犬中，解剖学研究报告了两种常见模式，包括三条或四条分支胆管。本回顾性描述性解剖学研究的目的是描述一组无肝胆疾病的拉布拉多猎犬中，根据可见分支胆管的位置和延伸，基于对比增强 CT 描述其大小和模式。还评估了胆管数量和尺寸与内脏脂肪面积百分比（VFA%）之间的相关性。在 40 只狗中，有 4 只可见右侧外侧胆管（RLD），9 只可见左侧外侧胆管（LLD），17 只同时可见。在 40 只狗中有 10 只未突出显示 RLD 和 LLD。当可见时，RLD 的中位直径为 0.23cm，中位长度为 0.82cm。LLD 的中位直径为 0.23cm，中位长度为 2.72cm。分支胆管插入前后胆总管的中位直径分别为 0.23cm 和 0.25cm。未发现与 VFA%之间存在相关性。在大多数取样犬（75%）中，可以使用对比增强 CT 观察到至少一条分支胆管。
