This article presents a rare case of myocarditis as a complication of myasthenia gravis (MG), an autoimmune disorder. The patient initially presented with symptoms resembling a heart attack, but further investigation revealed normal coronary arteries. A chest CT scan identified a suspicious mass in the anterior mediastinum, indicating a possible thymoma. Neurological deterioration led to a diagnosis of MG, which was confirmed through electromyography and nerve conduction studies. A cardiac MRI showed myocardial edema, severe left ventricular dysfunction, and late gadolinium enhancement in multiple segments of the heart. The final diagnosis was thymoma-associated MG with myocarditis. The patient responded well to immunosuppressive treatment. This case highlights the importance of considering myocarditis as a potential complication in MG patients presenting with cardiac symptoms, ECG changes, or elevated biomarkers.

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