Morphologycal Types of Intraparenchymal Spatial Distribution of Bile Ducts of Caudate Lobe. Study on Corrosion Casts

Abstract

Terminologia Anatomica (1998) homologates 2 ducts of caudate lobe (CLD): right (RCLD) and left (LCLD), each originating from the homonym hepatic duct (right ‐ RHD and left ‐ LHD). Our previous work evidenced variability both in origin and in number of the CLD. We analyzed on 150 hepatic corrosion casts the types of spatial distribution of CLD according to the number of ducts and the drainage level. The corrosion casts were made by injecting with plastic (AGO II paste and TECHNOVIT 7143) of the vasculo‐ductal systems, followed by parenchyma corrosion with hydrochloric acid. At first we analyzed the formation of the intrahepatic bile ducts system (IHBDS) and found 3 distinct aspects: Type I (modal, 84.67%) confluence of RHD with LHD; Type II (6%) confluence of LHD with the anterior branch (ABr) and the posterior branch (PBr); Type III (9.33%) confluence of LHD with ABr. We found 307 CLD, their number varying between 1‐3/cast (1 CLD in 13.33%; 2 in 68.67% and 3 in 18%). According to the number and drainage level of CLD we found 21 morphological types. RHD collects 32.90% of all CLD and LHD 54.72%. We found also CLD that drain into: lateral branch (1.30%) medial branch (0.32%), anterior branch (0.98%) and posterior branch (9.77%). In cases when the posterior branch drains into LHD, the number of collected CLD increases. Knowledge of CLD drainage in other elements of IHBDS than RHD and LHD is useful when planning and performing caudate lobe parenchyma surgery (Supported by CNMP 41092/2007).