Intrahepatic biliary strictures after liver transplantation

Area of Science:

• Hepatobiliary Surgery
• Transplant Immunology
• Vascular Anatomy

Background:

• Biliary complications, particularly nonanastomotic strictures and dilatations, are frequent after liver transplantation.
• These lesions are linked to factors like hepatic artery thrombosis, prolonged organ preservation, and immunological injury.
• Ischemic injury to the peribiliary vascular plexus is a primary suspected etiology.

Purpose of the Study:

• To review the anatomy of the biliary tract's arterial supply.
• To elucidate the etiology, clinical presentation, and diagnosis of intrahepatic biliary strictures (IHBS) post-liver transplant.
• To discuss management strategies and prognosis for IHBS.

Main Methods:

• Review of anatomical studies on the arterial supply of the bile duct.
• Analysis of literature on the etiology and risk factors for biliary complications post-liver transplantation.
• Synthesis of current diagnostic and therapeutic approaches for IHBS.

Main Results:

• The peribiliary vascular plexus is critical for bile duct blood supply; injury can lead to mucosal ischemia.
• Liver transplantation procedures inherently risk ischemic injury to the peribiliary vascular plexus and endothelial cells.
• Intrahepatic biliary strictures are often diffuse or bilateral, with percutaneous or endoscopic approaches as initial treatments.

Conclusions:

• Ischemic injury to the peribiliary vascular plexus is a key factor in developing IHBS after liver transplantation.
• Despite initial endoscopic or percutaneous treatments, a high threshold for surgical intervention, including retransplantation, is necessary due to significant mortality.
• Understanding biliary vascular anatomy is crucial for preventing and managing these complications.