Inflammation of the lungs. [MeSH]
Pathology.—Pneumonia is inflammation of the airspaces and/or interstitium (eg, due to infection, as in bacterial pneumonia). Infective pneumonia is characterized by exudate resulting in consolidation. The term is also used to refer to a number of noninfectious disorders of the lung parenchyma characterized by varying degrees of inflammation and fibrosis (eg, idiopathic interstitial pneumonias) (5). [Fleischner Society]