Biliary tract anatomy and its relationship with venous drainage

Area of Science:

• Vascular anatomy
• Hepatobiliary medicine
• Gastroenterology

Background:

• Portal cavernoma (PC) involves abnormal blood vessel development in response to portomesenteric venous obstruction.
• This condition can lead to morphological changes in the biliary ducts, termed portal cavernoma cholangiopathy (PCC).
• Existing literature on biliary tract venous drainage is limited, with more focus on arterial supply due to surgical relevance.

Purpose of the Study:

• To review the vascular supply of the biliary tract.
• To correlate vascularization patterns with biliary changes observed in portal cavernoma cholangiopathy.
• To highlight the significance of venous drainage in the context of portomesenteric venous obstruction.

Main Methods:

• Comprehensive literature review of studies on biliary tract arterial supply and venous drainage.
• Analysis of anatomical descriptions of pericholedochal vascular plexuses.
• Correlation of vascular anatomy with clinical manifestations of portal cavernoma cholangiopathy.

Main Results:

• The biliary tract is supplied by arterial plexuses (paracholedochal and epicholedochal) originating from various arteries.
• Venous drainage occurs via similar epicholedochal and paracholedochal venous plexuses, forming porto-portal collaterals.
• The supraduodenal bile duct exhibits the poorest vascularization, making it vulnerable to ischemia.
• These venous plexuses can dilate, forming portal cavernoma in cases of venous obstruction.

Conclusions:

• The pericholedochal venous system plays a crucial role in the development of portal cavernoma.
• Understanding biliary vascularization is essential for managing portal cavernoma cholangiopathy.
• Further research into biliary venous drainage is warranted to elucidate its role in hepatobiliary diseases.