Here a typical lobar consolidation. First study the images, then continue reading. The findings are: increased density with ill-defined borders in the left lung the heart silhouette is still visible, which means that the density is in the lower lobe air-bronchogram Lobar consolidation is the result of disease that starts in the periphery and spreads from one alveolus to another through the pores of Kohn. At the borders of the disease some alveoli will be involved, while others are not, thus creating ill-defined borders. As the disease reaches a fissure, this will result in a sharp delineation, since consolidation will not cross a fissure. As the alveoli that surround the bronchi become more dense, the bronchi will become more visible, resulting in an air-bronchogram (arrow). In consolidation there should be no or only minimal volume loss, which differentiates consolidation from atelectasis. Expansion of a consolidated lobe is not so common and is seen in Klebsiella pneumoniae and sometimes in Streptococcus pneumoniae, TB and lung cancer with obstructive pneumonia. #Clinical #Radiology #CXR #AirBronchogram #LLL #Lobar #Pneumonia #RadiologyAssistant
