Interesting ImagesLow-Grade Myofibroblastic Sarcoma Demonstrated on 99mTc-MDP Bone Scan and 18F-FDG PET/CTHou, Wenxiu MD; Su, Minggang MD; Li, Qianrui MD; Tian, Rong MDAuthor Information From the Department of Nuclear Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan, China. Received for publication November 29, 2019; revision accepted March 16, 2020. Wenxiu Hou and Minggang Su contributed equally to this work. Conflicts of interest and sources of funding: This study was supported by the Key Projects of the Ministry of Science and Technology (grant 2017YFC0113304) and Science and Technology of Sichuan Province (grant 2019YFS0373). None declared to all authors. Correspondence to: Rong Tian, MD. Department of Nuclear Medicine, West China Hospital, Sichuan University, No. 37 Guoxue Alley, Chengdu 610041, Sichuan, China. E-mail: firstname.lastname@example.org. Clinical Nuclear Medicine: July 2020 - Volume 45 - Issue 7 - p 549-551 doi: 10.1097/RLU.0000000000003073 Buy Metrics Abstract A 24-year-old woman with left hip pain for 4 months was admitted. Radiographs of the left hip showed a radiolucent lesion in the proximal femur. The lesion demonstrated hypointensity on T1-weighted and high intensity on T2-weighted fat saturated images. 99mTc-MDP bone scan and 18F-FDG PET/CT illustrated intense radiotracer accumulation at the osteolytic lesion. Postoperative pathology confirmed a low-grade myofibroblastic sarcoma (LGMS). LGMS is a rare neoplasm, which often occurred in the head and neck region. Our case suggested that LGMS should be considered in the differential diagnosis of proximal femur lesion on 99mTc-MDP bone scan and 18F-FDG PET/CT. Copyright © 2020 Wolters Kluwer Health, Inc. All rights reserved.