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Anti\u2010Ribonucleoprotein antibodies were found to be present, and gadolinium\u2010based cardiac MRI showed non\u2010vascular subendocardial enhancement with diffuse symmetrical thickening of the left ventricular wall. A diagnosis of Mixed connective tissue disease with secondary cardiac amyloidosis was thus made, and the patient was successfully managed with intravenous cyclophosphamide, corticosteroids, and other supportive measures. 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