Loeffler's endocarditis in a patient with a new diagnosed Churg-Strauss syndrome (CSS): A case report.

Background: Loeffler's endocarditis is a rare disease, caused by endocardial involvement of esosinophils, which damages the heart and leads to endomyocardial fibrosis with consequent restrictive cardiomyopathy, mural thrombi or valvular dysfunction. The association between Loeffler's endocarditis and Churg-Strauss syndrome (CSS) was also reported. Abnormal elevation of peripheral eosinophil counts in a heart failure patient is a hint of disease.