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Published in: Journal of Inherited Metabolic Disease 3/2014

01-05-2014 | Original Article

Muscle MRI in patients with long-chain fatty acid oxidation disorders

Authors: Eugene F. Diekman, W. Ludo van der Pol, Rutger A. J. Nievelstein, Sander M. Houten, Frits A. Wijburg, Gepke Visser

Published in: Journal of Inherited Metabolic Disease | Issue 3/2014

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Abstract

Introduction

Muscle magnetic resonance imaging (MRI) is a useful tool for visualizing abnormalities in neuromuscular disorders. The value of muscle MRI has not been studied in long-chain fatty acid oxidation (lcFAO) disorders. LcFAO disorders may present with metabolic myopathy including episodic rhabdomyolysis.

Objective

To investigate whether lcFAO disorders are associated with muscle MRI abnormalities.

Methods

Lower body MRI was performed in 20 patients with lcFAO disorders, i.e. three carnitine palmitoyltransferase 2 deficiency (CPT2D), 12 very long-chain acyl-CoA dehydrogenase deficiency (VLCADD), three mitochondrial trifunctional protein deficiency (MTPD) and two isolated long-chain hydroxyacyl-CoA dehydrogenase deficiency (LCHADD).

Results

At the time of MRI, four patients had muscle weakness, 14 had muscle pain and 13 were exercise intolerant. Median creatine kinase (CK) level of patients at the day of MRI was 398 U/L (range 35-12,483). T1W and STIR signal intensity (SI) were markedly increased in MTPD patients from girdle to lower leg. VLCADD patients showed predominantly proximal T1W SI changes, whereas LCHADD patients mostly showed distal T1W SI changes. Prominent STIR weighted signal intensity increases of almost all muscle groups were observed in patients with VLCADD and LCHADD with very high CK (>11.000) levels.

Conclusions and relevance

lcFAO disorders are associated with specific patterns of increased T1W and STIR signal intensity. These patterns may reflect lipid accumulation and inflammation secondary to lcFAO defects and progressive muscle damage. Future studies are needed to investigate whether muscle MRI might be a useful tool to monitor disease course and to study pathogenesis of lcFAO related myopathy.
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Metadata
Title
Muscle MRI in patients with long-chain fatty acid oxidation disorders
Authors
Eugene F. Diekman
W. Ludo van der Pol
Rutger A. J. Nievelstein
Sander M. Houten
Frits A. Wijburg
Gepke Visser
Publication date
01-05-2014
Publisher
Springer Netherlands
Published in
Journal of Inherited Metabolic Disease / Issue 3/2014
Print ISSN: 0141-8955
Electronic ISSN: 1573-2665
DOI
https://doi.org/10.1007/s10545-013-9666-3

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