Abstract
Self-expandable metal stents (SEMSs) are commonly used to relieve malignant biliary obstruction. Covered self-expandable metal stents (CSEMSs) were introduced to improve the patency of SEMSs by preventing tissue ingrowth. Unlike uncovered self-expandable metal stents (USEMSs), which are integrated into the tumor or duct wall, CSEMSs do not embed, but have an increased risk of migration. Although several retrospective studies comparing these two types of stents for malignant biliary obstruction have shown longer patency with CSEMSs, prospective, randomized trials have not been able to confirm these results. Partially covered self-expandable metal stents (PCSEMSs) has been introduced to reduce migration with advantage of CSEMSs preventing tumor ingrowth. The aim of this study was to compare stent patency and clinical outcomes between PCSEMSs and USEMSs in malignant biliary obstruction.
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