This section is from the book "A Manual Of Pathology", by Guthrie McConnell. Also available from Amazon: A Manual Of Pathology.
Anemia of the lung seldom occurs. Is due to pressure causing vascular obstruction.
Acute hyperemia or congestion may be caused by the inhalation of irritating gases or it may be collateral, due to obstruction in some other part of the lung. It is also the first stage in inflammations of the lung. The organ is dark red in color; on section blood escapes from the cut surface. The tissue will float in water.