Consolidation involves the bronchi and surrounding parenchyma. It does not extend throughout the entire lobe.
Acutely inflamed bronchi with acute inflammatory infiltrate extending into surrounding parenchyma.
In the pre-antibiotic era, much was made of the division of pneumonia into bronchopneumonia and lobar pneumonia. There is, however, much overlap in these two patterns. At present, it is thought that the distinction is not of importance and appropriate measures include determining the causative agent and rendereing appropriate treatment.
From the slide collection of the late Dr. Charles Kuhn