The alveoli are filled with exudates the air is displaced conveing the lungs into a solid organ this description suggests:
Bacterial invasion by lung parenchyma causes the alveoli to be filled with inflammatory exudate,thus causing consolidation of the pulmonary tissue.(ref Robbins 9/e p704)
Chronic bronchitis
Bronchial asthma
Bronchiectasis
Lobar pnemonia
Respiratory system