Myopericarditis secondary to silent autoimmune thyroiditis: a case of severe thyrotoxicosis

Myopericarditis may be the initial and sole manifestation of silent autoimmune thyroiditis. Thyroid function testing should be routinely considered in young patients with chest pain and elevated troponins but normal coronary arteries.Early identification of thyroid dysfunction allows complete reversal of cardiac involvement with appropriate endocrine and anti-inflammatory treatment, preventing unnecessary invasive procedures.This case highlights a practical diagnostic pitfall that internists may encounter and underscores the importance of integrating endocrine evaluation in unexplained cardiac presentations.