We present a case of Loëffler endocarditis in a 45-year-old man. This syndrome is characterized by unexplained prolonged and marked hypereosinophilia (>1500 eosinophils/mm3), absence of a primary cause of hypereosinophilia and evidence of eosinophil-mediated organ damage. Detection of cardiac damage is based on electrocardiography, echocardiography, cardiac MRI and endomyocardial biopsy. Two-dimensional echocardiography is an essential tool for diagnosis. In this case, a transthoracic echocardiogram revealed a complete obliteration of the apex of both ventricles associated with a restrictive left ventricular filling pattern.