Fresh exudate of RBCs, neutrophils, and fibrin describes which pneumonia stage?

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Multiple Choice

Fresh exudate of RBCs, neutrophils, and fibrin describes which pneumonia stage?

This question tests recognition of the red hepatization stage in lobar pneumonia, which is defined by fresh exudate filling the alveoli that contains red blood cells, neutrophils, and fibrin. The intense capillary congestion and leakage bring in red cells along with fibrin and a storm of neutrophils, so the affected lung tissue becomes firm and has a deep red, liver-like appearance—hence the name red hepatization. This stage appears early in the course of the infection, typically a couple of days after onset, and precedes grey hepatization when the red cells have started to break down.

This question tests recognition of the red hepatization stage in lobar pneumonia, which is defined by fresh exudate filling the alveoli that contains red blood cells, neutrophils, and fibrin. The intense capillary congestion and leakage bring in red cells along with fibrin and a storm of neutrophils, so the affected lung tissue becomes firm and has a deep red, liver-like appearance—hence the name red hepatization. This stage appears early in the course of the infection, typically a couple of days after onset, and precedes grey hepatization when the red cells have started to break down.

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