Figure 4From: Threaded biliary inside stents are a safe and effective therapeutic option in cases of malignant hilar obstruction Cumulative patency durations of the metallic stents (MS) and the threaded inside plastic stents (Threaded PS). Kaplan–Meier estimation of the cumulative durations of stent patency in the MS (solid line; median duration, 150 days) and threaded PS groups (dotted line; median duration, 142 days).Back to article page