Special Techniques of Liver Transplantation: Living Donor Liver Transplantation With Right Posterior Sector Grafts and Extended Left Lobe Grafts; Auxiliary Partial Orthotopic Liver Transplantation, and Dual-Lobe Liver Transplantation.

Living donor liver transplantation (LDLT) constitutes the majority of liver transplants in Asia and advancements in LDLT techniques have expanded the range of allografts beyond the commonly used right lobe (RL). This review provides a comprehensive overview of lesser-known variants of allografts and LDLT techniques which include right posterior sector grafts (RPSG), dual-lobe liver transplantation (DLLT), auxiliary partial orthotopic liver transplantation (APOLT), and extended left lobe grafts with caudate concentrating on the technical aspects, current evidence, and their indications in contemporary practice of LDLT. The first section examines RPSGs, focussing on their potential as an alternative to RL grafts particularly when volumetric studies indicate a larger right posterior sector in donors. It addresses donor selection, surgical techniques, and potential complications. Next, the article explores DLLT, which optimizes graft volume through partial grafts from two donors. The emphasis is on the ethical considerations, surgical challenges, and haemodynamic risks, such as graft atrophy, highlighting the importance of careful donor selection and meticulous planning. The section on APOLT covers its application in treating acute liver failure (ALF) and metabolic liver diseases. The technique's ability to support liver function in ALF while avoiding long-term immunosuppression when the native liver regenerates is discussed, along with patient selection criteria and follow-up requirements. Finally, the review addresses left lobe grafts with caudate used in smaller adults and older children to increase functional graft volume and improve outcomes.