Angle of covered self-expandable metallic stents after placement is a risk factor for recurrent biliary obstruction

Figure 1 Measurement of the angle of covered self-expandable metallic stents after placement on abdominal radiograph. A: Covered self-expandable metallic stent (CSEMS) after placement; B: Measurement of the obtuse angle of CSEMS after the placement. 1: The lines extending from the proximal point to the narrowest point; 2: The lines extending from the distal point to the narrowest point. The obtuse angle of CSEMS after the placement between line 1 and line 2 was 132°. CSEMS: Covered self-expandable metallic stent.