Table 1.

Histologic Features of AFOP and Other Acute Lung Injury Patterns.

Predominant Histologic Distinction	AFOP	DAD	OP	EP
Intra-alveolar fibrin deposition	Yes, prominent	+/−, focal	+/−, focal	Yes, prominent
Intra-alveolar fibroblastic plugs (Masson bodies)	No	No	Yes, prominent	+/−, focal
Hyaline membranes	No	Yes, extensive	No	+/−, focal
Eosinophils parenchymal infiltrates	Rare	Rare	Rare	Yes, extensive

Abbreviations: AFOP, acute fibrinous and organizing pneumonia; DAD, diffuse alveolar damage; OP, organizing pneumonia; EP, eosinophilic pneumonia.