Abstract
We report the first 3 cases of inflammatory myopathy with abundant macrophages (IMAM) to be found in an Asian country. Diagnosis of IMAM was based on the infiltration of CD68+ macrophages into biopsied specimens, particularly the fascia. Proximal skeletal muscle symptoms and signs, elevation of creatine kinase, and myogenic changes in electromyography were found in all of the cases, and magnetic resonance imaging clearly revealed thickening of the fascia. Since dermatomyositis (DM)-specific skin alterations were not found, none of the patients in this study fulfilled Bohan and Peter’s criteria for DM; however, anti-PL-7 antibody was detected in case number 1. In addition, CD20+ B-cell infiltration into the fascia was also detected in all of the cases, indicating further transition to DM. Severe illness, namely macrophage activation syndrome and acute respiratory distress syndrome, occurred in case 1 but was resolved with intensive combination therapy. The other 2 cases also required glucocorticoids to achieve remission.
Abbreviations
- anti-ARS Abs:
-
Anti-aminoacyl tRNA synthetase antibodies
- anti-CADM-140-kD Abs:
-
Anti-clinically amyopathic dermatomyositis-140-kD polypeptide antibodies
- anti-155/140-kD Abs:
-
Anti-155/140-kD polypeptide antibodies
- ARDS:
-
Acute respiratory distress syndrome
- CHP:
-
Cytophagic histiocytic panniculitis
- CK:
-
Creatine kinase
- CT:
-
Computed tomography
- DM:
-
Dermatomyositis
- EMG:
-
Electromyography
- IMAM:
-
Inflammatory myopathy with abundant macrophages
- MAS:
-
Macrophage activation syndrome
- MRI:
-
Magnetic resonance imaging
- STIR:
-
Short-time inversion recovery
- TNF α:
-
Tumor necrosis factor α
- sTNFR:
-
Soluble TNR receptor
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S. Hara and T. Henmi contributed equal to this work.
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Hara, S., Henmi, T., Kawakami, A. et al. Clinical, serologic and magnetic resonance imaging of 3 cases of inflammatory myopathy with abundant macrophages in the Japanese population. Rheumatol Int 33, 1059–1064 (2013). https://doi.org/10.1007/s00296-010-1662-4
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DOI: https://doi.org/10.1007/s00296-010-1662-4