Table 1: Pathologic Features of the Idiopathic Interstitial Pneumonias

Table 1:
Pathologic Features of the Idiopathic Interstitial Pneumonias
Features	UIP	NSIP	BOOP	RB-ILD	DIP	LIP
Temporal appearance	Variegated	Uniform	Uniform	Uniform	Uniform	Uniform
Spatial appearance	Patchy	Uniform	Patchy	Patchy	Uniform	Patchy
Interstitial inflammation	Scant	Prominent	Mild	Mild-moderate	Rare	Alveolar septal T-cells
Collagen fibrosis	Always, patchy	Variable, diffuse	Occasional	Variable, peribronchiolar	Rare	Rare
Fibroblast proliferation	Prominent	Rare, diffuse	No	No	No	No
Organizing Pneumonitis	No	Variable	Yes	No	No	No
Microscopic honeycombing	Yes	Rare	Rare	No	No	No
Macrophage accumulation	Variable	Variable	No	Peribronchiolar, pigmented	Alveolar, non-pigmented	No