What are classes of hepatic resection? What is the extent?

Hepatic resections are classified as : Anatomical (based on the segmental liver anatomy) . Nonanatomical (Wedge resections,enucleations, and resectional debridement of devitalized tissue) Anatomical resections are preferred because: lower blood loss. lower incidence of positive resection margins (malignancy). Major resections must be performed in accordance with the segmental anatomy. The operation entails removal of a lobe or segment with its afferent and efferent vessels while avoiding injury to vessels and bile ducts supplying the remnant tissue.