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Percutaneous cholangioscopy in obstructed biliary metal stents
K A Hausegger1, H J Mischinger, R Karaic
1Department of Radiology, Karl-Franzens Universität Graz, Austria.
Cardiovascular and Interventional Radiology
|May 1, 1997
Summary
Biliary metal stent occlusion is often caused by incomplete stent incorporation, granulation tissue, bile sludge, and tumor overgrowth. Covered stents did not prevent tissue buildup or tumor ingrowth, leading to early occlusion.
Area of Science:
- Gastroenterology
- Interventional Endoscopy
- Biliary Interventions
Background:
- Self-expanding biliary metal stents are used to treat biliary obstructions.
- Stent occlusion remains a significant complication, necessitating reevaluation of causative factors.
Purpose of the Study:
- To investigate the reasons for biliary metal stent occlusion using percutaneous transhepatic cholangioscopy (PTCS).
Main Methods:
- PTCS was performed in 15 patients with obstructed biliary Wallstents.
- Stent occlusion causes were assessed, and biopsies were taken for histological analysis.
Main Results:
- Incomplete stent incorporation was observed in most patients.
- Granulation tissue, bile sludge, and tumor overgrowth were primary causes of occlusion.
- Stone formation and tumor ingrowth were less common causes.
Conclusions:
- Incomplete stent incorporation is a major factor in biliary metal stent occlusion.
- Granulation tissue, bile sludge, and tumor overgrowth are the most frequent causes.
- Covered stents did not consistently prevent occlusion due to tissue buildup or tumor ingrowth.