Interesting ImagesRadioiodine Retention Within Dilated Common Biliary Duct Mimicking Metastatic Thyroid Cancer Diagnosed by the Combination of SPECT/CT and MRIDai, Hongyuan BS; Huang, Rui MDAuthor Information From the Department of Nuclear Medicine, West China Hospital of Sichuan University, Chengdu, China. Received for publication January 29, 2020; revision accepted March 7, 2020. Conflicts of interest and sources of funding: This study was supported by National Nature Science Foundation of China (no. 81972502) and Sichuan Science & Technology Department Foundation (no. 2017SZ0119). None declared to all authors. Correspondence to: Rui Huang, MD, Department of Nuclear Medicine, West China Hospital of Sichuan University, No. 37 Guoxue Alley, Chengdu, 610041, People’s Republic of China. E-mail: email@example.com. Clinical Nuclear Medicine: October 2020 - Volume 45 - Issue 10 - p 787-788 doi: 10.1097/RLU.0000000000003054 Buy Metrics Abstract A 55-year-old woman with papillary thyroid carcinoma under total thyroidectomy and cervical lymph node dissection was referred for 131I radioiodine therapy. Posttherapeutic whole-body scintigraphy revealed increased focal uptake in the right upper abdomen, which localized to the region of the head of the pancreas on SPECT/CT fusion images. Further evaluation with MRI affirmed the radioiodine retention corresponded to bile duct dilation. Copyright © 2020 Wolters Kluwer Health, Inc. All rights reserved.