Keywords: BPDCN, blastic plasmacytoid dendritic cell neoplasm; CLS, capillary leak syndrome; CMR, cardiovascular cardiac magnetic resonance; DT, diphtheria toxin; ECV, extracellular volume; EF, ejection fraction; LV, left ventricular; NT-proBNP, N-terminal pro–B-type natriuretic peptide; blastic plasmacytoid dendritic cell neoplasm; capillary leak syndrome; myocardial edema; tagraxofusp.