Table 2.

Distinctive characteristics of acute eosinophilic pneumonia (AEP) and chronic eosinophilic pneumonia (CEP).

	Epidemiology	Clinical characteristics					Chest imaging	Treatment	Relapse
		Onset	History of asthma	Smoking history	Blood eosinophilia	BAL eosinophilia
AEP	~ 400*	< 1 month	No	> 75%	No	>25%	Bilateral areas of ground-glass, consolidation, interlobular septal thickening, and pleural effusion	Corticosteroids (2–4 weeks)	No
CEP	1–3%**	>2–4 weeks	Yes	10%	Yes	>25%	Homogeneous peripheral consolidation	Corticosteroids (long term) anti-IgE and anti-IL5 mAb	Yes

^*Reported cases; ^**Interstitial lung disease; BAL, Bronchoalveolar lavage; mAb, monoclonal antibody.