Response to Alemtuzumab in FIP1L1/PDGFRA-negative hypereosinophilic myocarditis on serial cardiac magnetic resonance imaging

![Figure][1] A 48-year-old Caucasian woman presented with 2 weeks of myalgias, arthralgias, headache, and neck stiffness. Total peripheral leukocyte count was 80.2 × 109/l with 72% eosinophils. A diagnosis of FIP1L1/PDGFRA -negative hypereosinophilic syndrome was made. The 12-lead