The upper lobe of the right lung is enlarged, grey and airless, the inscisi-on surface is dripping with turbid liquid, the pleura has many fibrinogenous films; microscopical examination of alveoles revealed exudate containing neutrophils, desquamated alveolocytes and fibrin fibers. The bronchus wall is intact. What is the most probable diagnosis?

Answer options

1. Interstitial pneumonia
2. Croupous pneumonia
3. Pulmonary abscess
4. Influenzal pneumonia
5. Focal pneumonia

Explanation

Lobar (Croupous) pneumonia usually has an acute progression. Classically, the disease has four stages: Congestion in the first 24 hours: This stage is characterized histologically by vascular engorgement, intra-alveolar fluid, small numbers of neutrophils, often numerous bacteria. Grossly, the lung is heavy and hyperemic. Red hepatization or consolidation: Vascular congestion persists, with extravasation of red cells into alveolar spaces, along with increased numbers of neutrophils and fibrin. The filling of airspaces by the exudate leads to a gross appearance of solidification, or consolidation, of the alveolar parenchyma. This appearance has been likened to that of the liver, hence the term "