Cholelithiasis with Chronic Cholecystitis: a Potential Cause of False-Positive Whole-Body I-131 Scans in Thyroid Carcinoma, Hybrid SPECT/CT and Scintigraphic Planar Imaging

摘要

False-positive whole-body 1-131 scans are not very frequent but may cause a dilemma in the agement of patients with differentiated thyroid cancer. We report a 58-year-old woman who was referred for 1-131 therapy following total thyroidectomy for invasive papillary thyroid cancer with lymph node metastases. She was given 150 mCi of 1-131 and a post-therapy scan showed uptake in the nose, thyroid bed and subhepatic area. Hybrid SPECT/CT of the subhepatic area as focus of interest vealed uptake in the gallbladder with cholelithiasis. Patient underwent a diagnostic computed tomography of abdomen which showed cholelithiasis with chronic inflammation.