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CASE REPORTS
JOURNAL ARTICLE
Successful Immunosuppressive Treatment of Mixed Connective Tissue Disease Complicated by Microscopic Polyangiitis.
Tohoku Journal of Experimental Medicine 2016 June
Mixed connective tissue disease (MCTD) is characterized by a combination of clinical features of systemic lupus erythematosus, systemic sclerosis, and polymyositis with elevated antibodies to U1 small nuclear ribonucleoprotein (U1-RNP). MCTD is often accompanied by interstitial lung disease as pulmonary involvement. On the other hand, microscopic polyangiitis (MPA) is a systemic autoimmune disease characterized by the inflammation of small vessels (arterioles, capillaries, and venules) mainly affecting the lung and kidney. MPA is associated with elevated serum anti-neutrophil cytoplasmic antibody (ANCA). Complication of MPA in patients with MCTD is rare. So far, only nine case reports of MCTD complicated by MPA with serum myeloperoxidase-specific ANCA (MPO-ANCA) are available. Here, we describe a 64-year-old male suffering from MCTD with MPA. The patient developed interstitial pneumonia with alveolar hemorrhage accompanied by myositis, scleroderma, and elevated anti-U1-RNP antibody and MPO-ANCA levels with substantial systemic inflammation. Strong immunosuppressive therapy (corticosteroid, intravenous immunoglobulin, and cyclosporine A) ameliorated the myositis, interstitial lung disease, and inflammation, with the decrease of MPO-ANCA levels, despite that severe lung complications are often associated with poor outcomes. In conclusion, MCTD may be accompanied by MPA with alveolar hemorrhage. Severe lung complications may indicate a poor outcome, and therefore prompt immunosuppressive treatment should be performed in such patients.
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