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In this detailed EUS tutorial, we explore the segmental ducts of the liver and their relationship with the portal venous system step by step. Using sequential EUS images (A–D), this video explains how the segment 2, 3, and 4 ducts are visualized during clockwise rotation, how to interpret their orientation in relation to the left portal vein (LPV), right portal vein (RPV), and left hepatic vein (LHV), and how to identify the caudate (segment 1) and segment 5 regions. Learn how to apply fundamental EUS orientation rules: The caudal end of the transducer corresponds to the left side of the EUS image. The cranial end corresponds to the right side of the EUS image. The acoustic field in the esophagus is from posterior to anterior. On clockwise rotation, new structures appear from the right side of the image. By understanding these relationships, you can systematically interpret intrahepatic biliary anatomy, recognize segmental duct confluence, and accurately localize lesions or strictures during diagnostic and therapeutic EUS procedures. 🎯 Key Learning Points: EUS anatomy of left and right hepatic ducts Relation of ducts with left and right portal veins Identifying segmental ducts II, III, IV, V, and I Recognizing orientation changes during probe rotation Clinical relevance in hilar obstruction and biliary drainage 📚 Ideal for: Gastroenterology residents, hepatologists, and EUS trainees aiming to master segmental orientation and biliary anatomy. Facebook link of tutor: / 16dnpz7hhe