Interesting ImagesIntense 68Ga-Pentixafor Activity in Idiopathic Retroperitoneal FibrosisShu, Qiaoqiao MD∗,†,‡; Hu, Mei MD§; Deng, Maoxue MD∗,†,‡; Chen, Yue MD∗,†,‡; Cai, Liang PhD∗,†,‡ Author Information From the ∗Department of Nuclear Medicine, The Affiliated Hospital of Southwest Medical University †Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province ‡Institute of Nuclear Medicine §School of Pharmacy, Southwest Medical University, Luzhou, Sichuan, People’s Republic of China. Received for publication April 27, 2022; revision accepted July 5, 2022. Conflicts of interest and sources of funding: none declared. Correspondence to: Liang Cai, PhD, Department of Nuclear Medicine, The Affiliated Hospital of Southwest Medical University, Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Institute of Nuclear Medicine, Southwest Medical University, No. 25 TaiPing St, Jiangyang District, Luzhou, Sichuan 646000, People's Republic of China. E-mail: [email protected]. Clinical Nuclear Medicine: December 2022 - Volume 47 - Issue 12 - p e760-e761 doi: 10.1097/RLU.0000000000004375 Buy Metrics Abstract A 52-year-old man was admitted to our hospital with lower abdominal and low back pain, and abdomen CT at an outside hospital presented a retroperitoneal mass with left urinary tract obstruction and hydronephrosis. In 68Ga-pentixafor PET/CT, the retroperitoneal mass showed intense radioactivity. Subsequently, the patient underwent biopsy of the retroperitoneal mass. The pathological examination showed only fibrous tissue without tumor cells. The patient was finally diagnosed with idiopathic retroperitoneal fibrosis. Our case demonstrated that idiopathic retroperitoneal fibrosis had intense uptake of 68Ga-pentixafor. Copyright © 2022 Wolters Kluwer Health, Inc. All rights reserved.