胰腺癌位于腹膜后 ,位置隐蔽 ,临床症状不典型 ,早期诊断极为困难 ,手术切除率低 ,预后差 ,术后5年生存率多不超过 5%。因此 ,提高胰腺癌预后的唯一手段就是早期诊断 ,尽早手术切除。近年来 ,由于内镜技术及医学影像学技术的不断发展 ,胰腺癌的诊断水平有了一定提高 ,但早期诊 Pancreatic cancer is located in retroperitoneal, hidden position, atypical clinical symptoms, early diagnosis is extremely difficult, low surgical resection rate, poor prognosis, postoperative 5-year survival rate of no more than 5%. Therefore, to improve the prognosis of pancreatic cancer is the only means of early diagnosis, as soon as possible surgical resection. In recent years, due to the continuous development of endoscopic techniques and medical imaging techniques, the diagnosis of pancreatic cancer has been somewhat improved, but the early diagnosis