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25 April 2017 : Case report  USA

A Rare Case of Necrotizing Myopathy and Fibrinous and Organizing Pneumonia with Anti-EJ Antisynthetase Syndrome and SSA Antibodies

Challenging differential diagnosis, Unusual or unexpected effect of treatment, Unexpected drug reaction, Educational Purpose (only if useful for a systematic review or synthesis), Rare coexistence of disease or pathology

Muhammad Kashif1AEF, Divya Arya2BEF, Masooma Niazi3CDE, Misbahuddin Khaja1ABCDEF*

DOI: 10.12659/AJCR.903540

Am J Case Rep 2017; 18:448-453

Abstract

BACKGROUND: Idiopathic inflammatory myopathies are autoimmune disorders that can involve the skin, joints, muscles, and lungs. The most common of these disorders are dermatomyositis, polymyositis, overlap syndrome, and inclusion body myositis. Necrotizing autoimmune myopathy is an idiopathic inflammatory myopathy that is rarely associated with Sjögren’s syndrome. The most common lung findings associated with anti-EJ antisynthetase syndrome are nonspecific interstitial pneumonia and usual interstitial pneumonia; this condition is rarely associated with fibrinous and organizing pneumonia.

CASE REPORT: Here, we present a rare case of necrotizing myopathy and fibrinous and organizing pneumonia in a 34-year-old African American man with Sjögren’s syndrome and anti-EJ antibodies. The patient’s presenting symptoms were cough and proximal muscle weakness of the extremities. He had elevated serum creatine kinase level, aldolase level, and erythrocyte sedimentation rate. Myositis panel was positive for anti-EJ antibodies. Chest radiography was consistent with bilateral interstitial infiltrates. CT chest showed patchy bilateral infiltrates. Quadriceps muscle biopsy revealed widespread necrotic fibers and lung biopsy showed fibrinous and organizing pneumonia. The patient responded well to immunoglobulin therapy, mycophenolate, and prednisone, which resulted in complete resolution of bilateral infiltrates and improved muscle pain and weakness.

CONCLUSIONS: Myopathies are characterized by myalgia and muscle weakness due to muscle fiber dysfunction and are associated with autoimmune diseases. Histopathological features may differ in idiopathic inflammatory myopathies. It is important to recognize the rare association of anti-EJ autoantibodies with necrotizing myopathy and interstitial lung disease, which responds well to methylprednisolone and intravenous immunoglobulin.

Keywords: Lung Diseases, Interstitial, myositis, Sjogren's Syndrome

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American Journal of Case Reports eISSN: 1941-5923
American Journal of Case Reports eISSN: 1941-5923