Info
eosinophilia
(>500/µL)
Infection
Usually parasitic (helminths)
Allergic
Drugs; asthma, hay fever, eczema; ABPA
Collagen vasc dis
RA, EGPA (Churg-Strauss), eosinophilic fasciitis, PAN
Endocrine
Adrenal insufficiency
Neoplasm
HL, CML, mycosis fungoides, carcinomas, systemic mastocytosis
Atheroembolic dis
Cholesterol emboli syndrome
Multiorgan involvement incl. heart & CNS, a/w FIP1L1-PDGFRA fusion (NEJM 2003;348:1201); often steroid resistant