The shapes of malignant obstruction conclude sudden interruption, dull papilla, bill shape and being narrow gradually with respective percentage of 44.7%, 23.7%, 26.3% and 5.3%.

• 恶性梗阻胆管末端形态主要有不规则截断状、圆钝乳头状、鸟嘴状、逐渐变窄形等；分别占44.；7%25、23