Stages of pneumonia I. Congestion – lobes are heavy, red and boggy; histologically, vascular congestion can be seen with proteinaceous fluid, scattered neutrophils and many bacteria in the alveoli. II. Red hepatization – alveolar spaces are packed with neutrophils, red cells, and fibrin, pleura – fibrinous or fibrinopurulent exudate. III. Gray hepatization – lung is … Read more