Abstract
Two patients with linear scleroderma (en coup de sabre) developed systemic lupus erythematosus (SLE). This association has been well documented in only one previous case. The presence of high titer antibodies to ribonucleoprotein (RNP) initially led to the diagnosis of the mixed connective tissue disease. Development of more serious clinical involvement and antibodies to Sm (case 1) or native deoxyribonucleic acid (nDNA) (case 2) helped establish a diagnosis of SLE. Use of these studies in the differential diagnosis of systemic rheumatic diseases is disucssed briefly. The presence of anti-RNAP antibodies in patients with localized scleroderma may herald a more serious rheumatic disease.
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