[18F]FDG PET/CT in Benign and Malignant Diseases Involving the Biliary Tract.

Role of FDG PET/CT in evaluation of biliary tract diseases remains relatively unexplored. PET/CT with FDG helps in evaluation of both infective / inflammatory as well as neoplastic diseases as increased glucose utilization is observed in both the conditions. In this article, we describe the spectrum of FDG PET/CT findings in various diseases affecting the biliary tract. Role of FDG PET/CT in neoplastic diseases involving the biliary duct has been described at the time of staging and response evaluation; in characterization of the intrahepatic mass (abscess v/s cholangiocarcinoma). In addition, we have discussed about the false positive FDG uptake along the biliary duct stent, which interfere with scan interpretation. Few of the benign conditions described are Langerhans cell histiocytosis and IgG4 related disease involving the biliary duct and adenomyomatosis and Xanthogranulomatous cholecystitis involving the gall bladder.