Chronic pulmonary congestion
[[File:Histopathology of chronic pulmonary congestion.jpg|thumb|Chronic pulmonary congestion, showing a siderophage (characterized by coarse brown pigment, which is slightly refractile), and interstitium with edema, hemosiderin deposition and collagenous thickening. Chronic pulmonary congestion manifests mainly as thickened and fibrotic septa, and alveolar spaces containing numerous siderophages.
- . Congestion. Humpath (2005-12-19).