Since the description of Loffler’s endomyocardial disease1 by Loffler in 1936 [1] the association of eosinophilia with endomyocardial disease has been brought to the attention of many workers in the field of cardiology and pathology. Loffler’s endomyocardial disease is one of the entities included in the group of diseases known as cardiomyopathies. Cardiomyopathy is now defined as “heart muscle disease of unknown cause” [2], and Loffler’s endomyocardial disease is classified under restrictive cardiomyopathy. Also included in that group is a condition known as endomyocardial fibrosis, the pathology of which was first described by Davies in 1948 [3]. Since these early reports these conditions have been considered as separate entities, the former believed to be limited to the temperate zones, the latter to the tropical areas of the world. Evidence will be presented to show that these entities belong to the same disease process.