EUS (ultrasound endoscopy) is reliable for checking pancreas, especially for small pancreatic tumors, which is often more accurate than enhanced CT, mainly due to the fact that EUS utilizes ultrasound imaging technology for dynamic real-time display, and is beneficial for drug treatment and observation with contrast agents. 1. Ultrasound imaging technology: If the patient has a small tumor in the pancreas, ultrasound endoscopy can scan the texture of the pancreas and display the internal echoes for observation; for the suspicious lesions can also be enlarged and displayed, which is conducive to the early detection of lesions and clinical staging. 2. Dynamic real-time display and auxiliary treatment: compared with enhanced CT, ultrasonic endoscopy can observe the pancreas dynamically in real time, which is of high value and can effectively help doctors observe the pancreas dynamically and reduce the possibility of missed diagnosis; it can also be used to perform fine-needle puncture biopsy under the guidance of ultrasonic endoscopy, and provide analgesic treatment for the pancreas or drug injections, such as ethanol and so on. 3. It can be used with contrast agent for observation: intravenous contrast agent can be used for ultrasonography of pancreatic blood vessels to provide precise observation of pancreatic blood supply or course and increase the possibility of early detection of pancreatic lesions. Whether EUS can detect lesions depends on the size and location of the lesions or the level of hospitalization of the patient, so the specific examination plan should be based on the doctor.