- Rare, idiopathic d/o assoc w/infiltration of lung w/esos
- Acute variant w/more rapid infiltration of lung compared w/chronic
- Acute variant: avg 20s, m>>f, active smoking
- Chronic variant: w>m, hx asthma
- Acute variant: acute (over days to few weeks), severe, f, cough, sob, sputum; eos on labs
- Chronic variant: sub-acute to chronic (typically over > 2w) cough, sob, wheezing; typically not severe; sometimes wt loss/systemic sx; eos on labs
- Often delays in dx as rx for copd/asthma/pneumonia
- Acute variant: f, abnormal vital signs, diffuse rales
- Chronic variant: sometimes wheezing, rales