A 45-year-old-woman with giant cell myocarditis showing high titer of circulating antiheart antibodies is reported. She experienced two recurrences of myocarditis and repeatedly responded to immunosuppressive therapy using prednisolone. The titer of antiheart antibodies went up and down appropriately according to the clinical responses to immunosuppressive therapy. This case suggested that giant cell myocarditis might be related to autoimmunity.
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