Laparoscopic Anatomic S7+S8d Resection Preserving Inferior Right Hepatic Vein and S6 with Right Hepatic Vein Transection

Conventional right hepatectomy for tumors involving segments S7 and S8 poses significant challenges due to the intricate anatomy of this region, where interlaced hepatic veins and Glissonean pedicles complicate boundary demarcation. These complexities result in high risks of hemorrhage, iatrogenic injury to adjacent functional segments, and potential tumor residue. To address tumors adherent to the right hepatic vein (RHV) and adjacent to segment S6 in the superior right liver, this study introduces an anatomical resection of segments S7 and S8d with S6 preservation via the Laennec's capsule approach. By innovatively integrating membrane anatomy theory with hepatic vein control techniques, this method optimizes surgical pathways and critical structure management. Guided by Laennec's capsule, the procedure establishes a dissectible plane for precise RHV transection, suggesting a potential framework for radical resection of dorsally located right-liver tumors. Its observed advantages include a balance between oncological radicality and functional preservation in complex anatomical zones through combined membrane anatomy principles and individualized inflow control, particularly beneficial for high-risk patients requiring maximal parenchymal sparing.