Fig. 2

A 56-year-old female with common bile duct inflammation stenosis was misdiagnosed as having duodenal papillary carcinoma by CEUS; (a) MRCP image shows dilation of the intrahepatic and extrahepatic bile ducts with the lower part of the CBD tapering gradually (arrow) and the gallbladder increasing significantly. b Coronary contrast-enhanced T1WI shows the lower part of the CBD gradually becoming thin and occlusive (arrow) with no definite sign of mass-occupying lesions in the travel area of the intrahepatic and extrahepatic bile ducts; (c) Axial T1-weighted DCE-MR image shows the obstruction plane is in the lower part of the CBD (arrow), and the possibility of inflammatory stenosis and occlusion is considered. d DWI shows no abnormal signal is found; (e) CUS displays the choledochoectasia; (f, g) Uneven and highly intensified duodenal papilla region (arrow), and duodenal papillary carcinoma is considered; (h) Histopathological examination shows proliferative fibrous connective tissue of the bile duct wall, and the hyperplastic bile duct epithelium can be seen in the deep layer of the bile duct wall. CBD: common bile duct