“…[1,2] Specifically, organ damage secondary to eosinophil infiltration underlies airway and lung parenchymal, cardiac and gut involvement, while mononeuritis multiplex, glomerulonephritis and purpura characterize the vasculitic phase. [3][4][5] We report the clinical disease course of a gentleman with steroid-resistant EGPA characterized by recalcitrant peripheral eosinophilia, central and peripheral nervous system involvement, myocarditis, diffuse alveolar hemorrhage (DAH), necrotizing myopathy, and extensive eosinophilic degranulation in gastrointestinal tissues; the latter only apparent after staining with targeted monoclonal antibodies to eosinophil peroxidase (EPX). This case highlights the synchronous presentation of multiple rare manifestations of EGPA, highlighting the multisystem complexity and clinical heterogeneity of this disease entity.…”