随着超声技术的不断发展，目前对总胆管下段梗阻病因诊断已有明确的认识，但因种种原因未能及早作出提示与诊断。十二指肠乳头处疾患发病率并不低，又是肿瘤的好发部位，近年来肿瘤的发病率有上升趋势，许多患者就诊时已晚。虽然胃镜超声直观、定位准确，但不易普及。ERCP亦不 With the continuous development of ultrasound technology, there is a clear understanding of the etiological diagnosis of the obstruction of the lower bile ducts. However, due to various reasons, prompt and diagnosis can not be made as early as possible. Duodenal papilla at the incidence of disease is not low, but also a good site for cancer, the incidence of cancer in recent years there is an upward trend, many patients have been treated late. Although endoscopic ultrasound intuitive, accurate positioning, but not easy to popularize. ERCP nor