Radiologic Assessment for Endoscopic US-guided Biliary Drainage.

Area of Science:

• Gastroenterology
• Interventional Radiology
• Medical Imaging

Background:

• Endoscopic US-guided biliary drainage (BD) is a key intervention for biliary obstruction.
• It is primarily indicated when conventional transpapillary endoscopic retrograde cholangiodrainage is unsuccessful.
• This procedure creates an extra-anatomic drainage route using stents between the GI tract and the biliary system.

Purpose of the Study:

• To review the indications, techniques, and outcomes of endoscopic US-guided BD.
• To highlight the role of CT in preprocedural assessment and postprocedural monitoring.
• To discuss potential complications and stent malfunctions associated with endoscopic US-BD.

Main Methods:

• Review of procedural types including hepaticogastrostomy, hepaticojejunostomy, choledochoduodenostomy, hepaticoduodenostomy, and gallbladder drainage.
• Emphasis on the critical role of CT imaging for patient selection and follow-up.
• Analysis of reported technical and clinical success rates and complication incidence.

Main Results:

• Technical success rates range from 94%-97%, with clinical success rates from 88%-100%.
• CT is essential for evaluating obstruction type, collateral vessels, ascites, liver volume, tumor distribution, and GI tract patency.
• Common post-procedural findings include small amounts of intraperitoneal gas and localized GI tract changes.

Conclusions:

• Endoscopic US-guided BD is a highly successful alternative for biliary obstruction.
• CT plays an indispensable role in optimizing patient selection and monitoring outcomes.
• Awareness of potential complications, such as stent malfunction and fistulas, is crucial for patient management.