Abstract
Polymyositis with mitochondrial pathology (PM-Mito) is a rare form of idiopathic inflammatory myopathy with no definite diagnostic criteria and similarities to both PM and sporadic inclusion body myositis (s-IBM). The aim of this study is to address the dilemma of whether PM-Mito is a subtype of inflammatory myopathy or represents a disease falling into the spectrum of s-IBM. Herein, we report four female patients diagnosed with PM-Mito, highlighting their rather atypical clinical and histopathological characteristics that seem to indicate a diagnosis away from s-IBM. Muscle weakness was rather proximal and symmetrical and lacked the selective pattern observed in s-IBM. Patients had large-scale deletions in mtDNA, reflecting the mitochondrial component in the pathology of the disease. Conclusively, our study adds to the limited data in the literature on whether PM-Mito is a distinct form of myositis or represents a prodromal stage of s-IBM. Although the latter seems to be supported by a substantial body of evidence, there are, however, important differences, such as the different patterns of muscle weakness, and the good response to treatment observed in some patients. Larger-scale studies are certainly needed to clarify pathogenesis and clinical characteristics of PM-Mito patients, especially in therapeutic and prognostic terms.
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GKP: study concept and design, writing, revising the manuscript, accepts responsibility for all research, giving final approval. CK: study concept, mtDNA analysis and interpretation of data, revising the manuscript, giving final approval. SX: acquisition, analysis and interpretation of data. MC: analysis and interpretation of data. EK: study design, drafting, revising the manuscript, giving final approval. CP: study concept, drafting, revising the manuscript, giving final approval.
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Papadimas, G.K., Kokkinis, C., Xirou, S. et al. Polymyositis with mitochondrial pathology or atypical form of sporadic inclusion body myositis: case series and review of the literature. Rheumatol Int 39, 1459–1466 (2019). https://doi.org/10.1007/s00296-019-04314-8
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DOI: https://doi.org/10.1007/s00296-019-04314-8