Preprocedural work-up imaging 胆道扩张 Dilated bile ducts? 解剖变异 Anatomic variations? 阻塞水平/原因/阻塞范围 Level/cause/extension obstruction? 肝萎缩 Atrophy liver? 腹水 Ascites? 胆道是否扩张? 可以通过超声或CT/MRI等影像学容易识别出来...