The middle lobe shows diffuse consolidation (grey hepatization) of lobar pneumonia. The other lobes were not involved. The tumor is metastatic from a cancer of the mouth.
Bacterial Infections
Lobar pneumonia (with metastatic tumor)
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The middle lobe shows diffuse consolidation (grey hepatization) of lobar pneumonia. The other lobes were not involved. The tumor is metastatic from a cancer of the mouth. |
Lobar pneumonia
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Alveoli are filled with PMNs, macrophages, and fibrinous exudate; alveolar walls are intact. This stage corresponds to grey hepatization. The preceding red hepatization was characterized by more RBCs in the alveoli. | ||||||
Lobular pneumonia
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Some organisms involve multiple lobules but not the whole lobe--lobular pneumonia. Legionnaire's disease is one of these. The alveoli of this lobule are filled with blood and PMNs. Adjacent lobules were much less involved. | ||||||
Legionella bacilli
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A Dieterle silver stain shows short rods, which are gram negative. A direct fluorescent antibody test can be used for typing. | ||||||
