LAUSR

Eosinophilic myocarditis is a rare and potentially lethal disease characterized by eosinophil infiltration of the myocardium.1 The association between eosinophilia and myocardial injury is well established and may present several etiologies, from hypersensitivity and autoimmune diseases to neoplasias and infections.1,2 In some cases the etiology remains unknown, and it is denominated idiopathic hypereosinophilic syndrome. Clinical manifestations present a wide spectrum, ranging from mild symptomatology to severe symptoms such as retrosternal pain, rhythm disturbances, and sudden death.2,3 The definitive diagnosis is made through endomyocardial biopsy.1 Cardiac magnetic resonance imaging is a valid alternative, identifying the main structural changes caused by myocarditis.4 Treatment includes neurohumoral therapy, management of cardiac complications, and in cases selected, systemic corticosteroid therapy.5 Next, we present the case of a patient with symptomatology suggestive of myocardial infarction, but who in the course of the investigation had the diagnosis of eosinophilic myocarditis.