Diffuse-Type Tenosynovial Giant Cell Tumor of the Shoulder Evaluated by FDG PET/CT

Diffuse-type tenosynovial giant cell tumor is a locally aggressive neoplasm that typically involves the knee and hip but rarely involves the shoulder. In this case, a 74-year-old woman presented a painless mass in the right shoulder. FDG PET/CT demonstrated intense FDG uptake with an SUVmax of 19.2 in the lesion. The mass was dissected and confirmed as diffuse-type tenosynovial giant cell tumor by pathology. Follow-up FDG PET/CT assessment revealed more extensive soft tissue infiltration and adjacent bone erosion 3 years after surgery. Thus, FDG PET/CT well demonstrated the hypermetabolic and local aggressive characteristics of the lesion. Received for publication October 17, 2018; revision accepted November 27, 2018. Conflicts of interest and sources of funding: none declared. Correspondence to: Ling Wang, MD, The First Affiliated Hospital of Wenzhou Medical University, Xuefu North Road, Wenzhou, Zhejiang 325000, China. E-mail: laohu9823@163.com. Copyright © 2019 Wolters Kluwer Health, Inc. All rights reserved.

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