Figure 5From: Endoscopic stenting for hilar cholangiocarcinoma: efficacy of unilateral and bilateral placement of plastic and metal stents in a retrospective review of 480 patients Cumulative Stent Patency curves by Kaplan-Meier analysis in patients treated using unilateral (Uni) and bilateral (Bil) plastic stents (PS) and self-expandable metal stents (SEMS). Uni PS versus Bil PS (p = 0.0004). Uni versus Bil SEMS (p < 0.0001).Back to article page