Giant cell myocarditis attributable to myositis: therapeutic management under the guidance of serial endomyocardial biopsy-a case report.

We presented a case of refractory giant cell myocarditis preceded by giant cell myositis. While endomyocardial biopsy is an approach with risk of procedural complications, it can guide giant cell myocarditis management when the initial immunosuppressive therapy is ineffective.