A condition observed in lungs in which there is an advanced degree of acute passive congestion, or acute pneumonitis (sometimes termed interstitial pneumonia), or a similar pathologic process. ... (05 Mar 2000) ... 
red, congested lung tissue seen in idiopathic pulmonary fibrosis.
Type: Term Definitions: 1. a condition observed in lungs in which there is an advanced degree of acute passive congestion, acute pneumonitis or a similar pathologic process.