Imaging of Pancreaticobiliary Maljunction

Area of Science:

• Gastroenterology
• Radiology
• Oncology

Background:

• Pancreaticobiliary maljunction (PBM) is a congenital anomaly where pancreatic and bile ducts join outside the duodenum, creating a long common channel.
• This anatomical variation bypasses the sphincter of Oddi, leading to pancreatico-biliary reflux and increased risk of biliary cancer, particularly in the gallbladder and common bile duct.
• Bile stasis associated with PBM is implicated in carcinogenesis, highlighting the need for early detection and intervention.

Purpose of the Study:

• To provide an overview of PBM, focusing on diagnostic imaging and management strategies for the condition and its complications.
• To emphasize the critical role of radiologists in identifying PBM and associated risks, especially in non-Asian populations where it is less common.
• To highlight the importance of vigilant follow-up imaging even after prophylactic surgery due to persistent cancer risk.

Main Methods:

• Review of diagnostic imaging modalities for PBM, including multidetector CT and MR cholangiopancreatography.
• Emphasis on characteristic imaging findings suggestive of PBM, such as extrahepatic bile duct dilatation or gallbladder wall thickening.
• Discussion of the importance of careful examination of pancreaticobiliary anatomy in suspected cases.

Main Results:

• Imaging findings are the primary method for diagnosing PBM.
• Specific imaging clues like bile duct or gallbladder abnormalities warrant detailed pancreaticobiliary anatomy assessment.
• Radiologists play a key role in the diagnosis and management of PBM and its complications.

Conclusions:

• Early diagnosis of PBM through imaging is essential for timely management and risk reduction of biliary cancer.
• Radiologists must be aware of PBM and its potential complications, even in non-Asian patients.
• Long-term surveillance imaging is necessary for PBM patients post-surgery due to ongoing cancer risk.