Differentiation of noncalculous periampullary obstruction: comparison of CT with negative-contrast CT cholangiopancreatography versus MRI with MR cholangiopancreatography

Abstract

• nCTCP with subvolume MinIP is a practical tool in evaluating biliary obstruction • Two image sets have a comparable performance in differentiating noncalculous periampullary obstruction • MDCT could serve as an alternative in patients not eligible for MRI.

Differentiation of pancreatobiliary-type from intestinal-type periampullary carcinomas using 3.0T MRI

“…Previous studies have provided the observation that overall survival was highest for patients with ampullary and duodenal cancers, intermediate for patients with bile duct cancers, and lowest for those with pancreatic cancers . Therefore, many investigators tried to differentiate the four types of tumor using different imaging techniques in order to predict patients' prognosis . However, due to the anatomical complexity of the periampullary region, correct classification with respect to location remains challenging, particularly if the tumor is large and involves more than one potential site of origin .…”

Preoperative evaluation of malignant pancreatobiliary obstruction: A novel technique for multiphase fusion 3D CT images

“…The imaging principle is based on the dilated bile ducts as a negative contrast agent for differentiation from the surrounding enhanced hepatic and pancreatic parenchyma without additional biliary contrast agent [12] . This technique was useful for identifying obstructive level, depicting complex biliary tree anatomy, and providing entire pancreatobiliary system in one image similar to of 3D MR cholangiopancreatography [13] ( Fig. 1 , Fig.…”

Role of endoscopic ultrasound in the evaluation of unexplained extrahepatic bile duct dilatation

“…But its value is still unsatisfying in the diagnosis in periampullary lesions. Previous studies have reported that the specificity was 75.68-100%, sensitivity was 60-100%, and accuracy was 91.17-92.92% in the diagnosis of periampullary space-occupying lesions [11][12][13][14]. Then, MRCP examination requires a magnetic field, which is contradicted for patients with metal implanted material, such as cardiac pacemaker, metal stent, etc.…”