Löffler's syndrome is defined by prolonged and profound eosinophilia and restrictive cardiomyopathy. Doppler echocardiography is useful in both the diagnosis and management of this entity. On the other hand, diastolic dysfunction is assessed better by transesophageal echocardiography than by transthoracic echocardiography, mainly in the analysis of pulmonary vein Doppler flow. We describe a patient with Löffler's syndrome, whose pulmonary vein flow, obtained by transesophageal echocardiography, was helpful for better management of the disease.