Eosinophilic endomyocardial disease.

Eosinophilic granulomatosis with polyangiitis is the rarest of the antineutrophil cytoplasmic antibody-associated vasculitides. We describe the case of a 58-year-old woman with a history of asthma found to have a left ventricular apical thrombus. Cardiac catheterization with endomyocardial biopsy was consistent with eosinophilic endomyocardial disease. The disease affects several organ systems and shares many features with more common conditions, making it a difficult diagnosis.