RT Book, Section A1 Tian, Cuixia A1 Zygmunt, Alexander M. A2 Hershey, Andrew D. SR Print(0) ID 1195238333 T1 The Inflammatory, Metabolic, and Toxic Myopathies T2 CURRENT Diagnosis & Treatment Pediatric Neurology YR 2023 FD 2023 PB McGraw Hill Education PP New York, NY SN 9781260457520 LK accesspediatrics.mhmedical.com/content.aspx?aid=1195238333 RD 2024/10/09 AB Myopathies are a heterogeneous group of disorders that affect the structure, function, or both structure and function of muscle fibers manifested most commonly by weakness in the patient. They may also present with either positive myopathic symptoms, such as cramps, contracture, hypertrophy, myalgia, or myoglobinuria, or negative myopathic symptoms, such as exercise intolerance, fatigue, muscle atrophy, or weakness.