Why is Couinaud classification essential in sonography?

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The main idea here is that Couinaud segmentation provides a precise map for locating disease within the liver on ultrasound. The liver is divided into eight functional segments based on the branches of the portal veins and hepatic veins, with the major hepatic veins serving as clear boundary landmarks. Because ultrasound can visualize these venous and portal landmarks, you can describe a lesion’s location by its segment rather than just by a lobe, which is crucial when anatomy varies between patients. This standardized, segment-based localization is essential for planning targeted interventions like biopsy, ablation, or surgical resection, and for communicating findings clearly among radiologists and surgeons. The purpose of this framework is to aid localization and management, not to define bile ducts, measure overall liver mass, or predict liver enzyme levels.