A solid hypoechoic nodule 2.0cm*1.0cm is seen anterior to the end of the common bile duct in the right upper abdominal cavity, which is considered to be a space-occupying lesion in the common bile duct, e.g. biliary polyp, localized hyperplasia, and malignant tumors cannot be excluded. Solid hypoechoic nodules in the common bile duct are usually low-density space-occupying lesions, which are mostly considered to be biliary polyps, but may also be due to hyperplasia caused by inflammation in the bile duct or space-occupying lesions caused by malignant tumors, which may be accompanied by bile duct dilatation, jaundice, abdominal pain and other clinical manifestations. Patients can choose enhanced CT, nuclear biliary water imaging, ERCP (endoscopic retrograde cholangiopancreatography) to conduct examinations to determine whether there are lesions in the entire biliary system, pancreatic duct system and duodenum. Patients are advised to go to the hospital and choose the appropriate examination method under the advice of the doctor to explore the cause so as not to cause delay of the disease.