Magnetic resonance imaging of skeletal muscles in sporadic inclusion body myositis

To analyse whether MRI of upper and lower extremity muscles in a large patient group with sporadic IBM (sIBM) is of additional value in the diagnostic work-up of sIBM. Thirty-two sIBM patients were included. Magnetic resonance (MR) parameters evaluated in 68 muscles of upper and lower extremity were...

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Published in:	Rheumatology (Oxford, England) England), 2011-06, Vol.50 (6), p.1153-1161
Main Authors:	COX, Fieke M, REIJNIERSE, Monique, VAN RIJSWIJK, Carla S. P, WINTZEN, Axel R, VERSCHUUREN, Jan J, BADRISING, Umesh A
Format:	Article
Language:	eng
Subjects:	Adult Aged Biological and medical sciences Cohort Studies Diseases of the osteoarticular system Female Humans Lower Extremity - pathology Magnetic Resonance Imaging - methods Male Medical sciences Middle Aged Muscle Weakness - pathology Muscle, Skeletal - pathology Muscular Atrophy - pathology Myositis, Inclusion Body - diagnosis Myositis, Inclusion Body - pathology Sensitivity and Specificity Severity of Illness Index Statistics, Nonparametric Upper Extremity - pathology
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Summary:	To analyse whether MRI of upper and lower extremity muscles in a large patient group with sporadic IBM (sIBM) is of additional value in the diagnostic work-up of sIBM. Thirty-two sIBM patients were included. Magnetic resonance (MR) parameters evaluated in 68 muscles of upper and lower extremity were muscle atrophy, fatty infiltration and inflammation. These findings were correlated with disease duration, weakness and serum creatine kinase (sCK) levels. Fatty infiltration was far more common than inflammation. Muscles most frequently infiltrated with fat were the flexor digitorum profundus (FDP), anterior muscles of the upper leg and all muscles of the lower leg, preferentially the medial part of the gastrocnemius. The rectus femoris was relatively spared compared with other quadriceps muscles as well as the adductors of the upper leg. Inflammation was common in general, but individually sparse, present in 78% of the patients with a median of two inflamed muscles per patient. A statistically significant correlation was found between the amount of fatty infiltration and disease severity, disease duration and sCK. We provide a detailed description of the MRI in sIBM and show a distinct pattern of muscle involvement. Relatively severe affliction of the medial compartment of the gastrocnemius, combined with relative sparing of the rectus femoris or involvement of the FDP can be indicative of sIBM. MRI can contribute to the diagnosis in selected patients with clear clinical suspicion, but lacking the mandatory set of muscle biopsy features.
ISSN:	1462-0324 1462-0332