Histologic changes: At the edge of the consolidated region, another lesion, illustrated in the two photos below, is found.

What type of cell is present in the capillary wall at the arrow?

What type of reaction is occurring in the adjacent alveolar spaces?

What type of cells are present in the more peripheral alveoli?

 

This polypoid lesion (arrow) attached to the alveolar wall is similar to that shown above but somewhat earlier in development. How can you tell that it is earlier?

What is the main cell type in the polyp?

What type of matrix surrounds these cells?

What is the diagnosis of these lesions? Answer

Note the alveolitis in the surrounding alveolar walls in both photos: increased inflammatory cells, type II cell hyperplasia, and increased alveolar macrophages.

Clinical summary Image 5

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Answer:

What type of cell is present in the capillary wall at the arrow? Mostly PMNs

What type of reaction is occurring in the adjacent alveolar spaces? Organization of alveolar exudate by granulation tissue

What type of cells are present in the more peripheral alveoli? Mostly RBCs, but some inflammatory cells including PMNs

 

This polypoid lesion attached to the alveolar wall is similar to that shown above but somewhat earlier in development. How can you tell that it is earlier? Because it does not yet show organization by fibroblasts.

What is the main cell type in the polyp? PMNs

What type of matrix surrounds these cells? Fibrinous exudate and RBCs.

 

Diagnosis: These lesions represent capillaritis.

Clinical summary Image 5

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