title: False-positive whole-body iodine-131 scan due to intrahepatic duct dilatation.
abstract: Focal retention of radioactivity in the liver on whole-body 131I scan was interpreted as a metastatic lesion in a patient with well-differentiated thyroid cancer. Intrahepatic duct dilatation, usually resulting from biliary tract obstruction by bile stone, is a common disorder and may cause bile stasis. A patient with papillary thyroid cancer and a previous history of biliary tract stones had focal retention of radioactivity in the liver on whole-body 131I scan. Abdominal CT, endoscopic retrograde cholagiopancreatography, radionuclide cholangiography and sequential 131I scans demonstrated that this focal retention of radioactivity was caused by intrahepatic duct dilatation. Focal retention of radioactivity is visualized on delayed images but not on early images. The radioactivity initially increases and then decreases on following days.
authors.affiliation: Department of Nuclear Medicine, Chang Gung Memorial Hospital, Taipei, Taiwan, ROC.
authors.forename: D L
authors.initials: DL
authors.lastname: You
authors.forename: K Y
authors.initials: KY
authors.lastname: Tzen
authors.forename: J F
authors.initials: JF
authors.lastname: Chen
authors.forename: P F
authors.initials: PF
authors.lastname: Kao
authors.forename: M F
authors.initials: MF
authors.lastname: Tsai
mesh_terms: D001653:Bile Ducts, Intrahepatic / Q000000981:diagnostic imaging* / Q000473:pathology; D002291:Carcinoma, Papillary / Q000000981:diagnostic imaging* / Q000556:secondary*; D002780:Cholestasis, Intrahepatic / Q000000981:diagnostic imaging* / Q000473:pathology; D003937:Diagnosis, Differential; D004108:Dilatation, Pathologic / Q000000981:diagnostic imaging / Q000473:pathology; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D007457:Iodine Radioisotopes; D008113:Liver Neoplasms / Q000000981:diagnostic imaging* / Q000556:secondary*; D008875:Middle Aged; D011877:Radionuclide Imaging; D013964:Thyroid Neoplasms / Q000473:pathology
chemical_list: D007457:Iodine Radioisotopes