Recent advances and problems in the management of pancreaticobiliary maljunction: feedback from the guidelines...

Area of Science:

• Gastroenterology
• Hepatobiliary Surgery
• Diagnostic Imaging

Background:

• The first clinical practice guidelines for pancreaticobiliary maljunction (PBM) were established in Japan in 2012.
• Congenital biliary dilatation, defined narrowly, includes Todani types I (excluding Ib) and IV-A, almost always associated with PBM.
• Pathophysiological issues like pancreatobiliary reflux arise from specific anatomical configurations in PBM.

Purpose of the Study:

• To review the current understanding and management of pancreaticobiliary maljunction (PBM).
• To highlight the need for revising diagnostic criteria for PBM to include advanced imaging techniques.
• To analyze the incidence of biliary cancer in patients with PBM and discuss treatment strategies.

Main Methods:

• Prospective ultrasonographic study to assess common bile duct diameter changes with age.
• Review of diagnostic imaging modalities including magnetic resonance cholangiopancreatography, MDCT, and EUS for PBM diagnosis.
• Analysis of nationwide survey data on biliary cancer incidence in PBM patients.

Main Results:

• The maximum diameter of the common bile duct increases with age in patients with PBM.
• Biliary cancer occurred in 21.6% of adult PBM patients with biliary dilatation and 42.2% without.
• Gallbladder cancer accounted for 88.1% of biliary cancers in PBM patients without biliary dilatation.

Conclusions:

• Current diagnostic criteria for PBM should be updated to incorporate advanced imaging results.
• Prophylactic flow-diversion surgery is indicated for PBM with biliary dilatation.
• Further research is essential to determine optimal surgical strategies for PBM without biliary dilatation, given its association with gallbladder cancer.