In these patients with necessity of PBD, a plastic stent (PS) has been used because it is good for temporary use with cheap prices. However, it is sometimes occluded before surgery or not enough for rapid decompressing jaundice mainly because of its short diameter. In this aspect, a self-expandable metal stent (SEMS) has strength compared to PS because it has a longer diameter which enables rapid decompression with a fewer events of occlusion. However, SEMS is much more expensive than PS and the exact length of stent is more critical.