Most malignant tumors causing bile duct obstruction, such as pancreatic adenocarcinoma, gallbladder carcinoma or cholangiocarcinoma, have an extremely poor prognosis. At the time of diagnosis the majority of these tumors will be unresectable with a median survival of 4-6 months. Palliation is the goal for those patients with unresectable tumors and limited survival and for those at high risk for attempts at curative resection.