Non-enhanced ultrasound (US) is underestimated for the delineation of pancreatic masses. An example of a well-delineated necrotic tumor is shown in Fig. 1.

• 非增强超声在描述胰腺包块方面常常是被低估的。图1显示的是一个很好的描述坏死性肿瘤的例子。