Focal Myositis of the Leg Presenting as Fever of Unknown Origin Detected by FDG PET/CT

Focal myositis is an uncommon inflammatory pseudotumor of the skeletal muscle that may mimic neoplastic and inflammatory diseases. We present one case of focal myositis involving the left proximal vastus lateralis and vastus intermedius, and left soleus showing intense FDG uptake on FDG PET/CT. This case indicates that focal myositis should be considered as a differential diagnosis in patients with focal hypermetabolic muscular lesions, including benign and malignant tumors, necrotizing autoimmune myopathy, nodular fasciitis, myositis ossificans, and muscular sarcoidosis. Received for publication October 17, 2018; revision accepted November 3, 2018. Conflicts of interest and sources of funding: none declared. Correspondence to: Yushu Bai, MD, Department of Orthopedics, Changhai Hospital, 168 Changhai Rd, Yangpu District, Shanghai 200433, China. E-mail: spinebaiys@163.com. Copyright © 2018 Wolters Kluwer Health, Inc. All rights reserved.

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