%0 Case Reports %T A case report on multiple acyl-CoA dehydrogenase deficiency with severe myopathy and osteoporosis. %A Li M %A Lin ZH %A Chen YC %A Lin P %A Xie YX %A Wei JC %J Int J Rheum Dis %V 27 %N 1 %D 2024 Jan 22 %M 37737545 %F 2.558 %R 10.1111/1756-185X.14906 %X A 35-year-old male patient presented fluctuating bilateral lower extremity weakness for 3 years. Physical examination showed grade 4 proximal muscle weakness in both lower extremities and grade 5 distal muscle weakness. Laboratory data revealed elevated creatine kinase, triglycerides, and cholesterol. Muscle pathology showed deposition of lipid droplet under the sarcolemma. Bone densitometry indicated severe osteoporosis. Next-generation sequencing revealed a pathogenic mutation in the ETFDH gene. The patient was diagnosed with late-onset multiple acyl-CoA dehydrogenase deficiency. After riboflavin treatment, symptoms of the patient were relieved, physical endurance was restored, and bone mineral density was improved.