Focal myositis (FM) is a rare disease characterized by focal inflammatory enlargement in a single skeletal muscle, and usually is cured without medication.1 It is important to distinguish FM from other diseases, especially localized nodular myositis, in which multiple nodular myositis could often develop into a generalized inflammatory disease, polymyositis.2
Misu T, Tateyama M, Nakashima I, Shiga Y, Fujihara K, Itoyama Y. Relapsing Focal Myositis: The Localization Detected by Gallium Citrate Ga 67 Scintigraphy. Arch Neurol. 2005;62(12):1930–1931. doi:10.1001/archneur.62.12.1930
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