Answer 1. What type of tissue fills the RB (respiratory bronchiole) and extends upward and toward the left between the arrows? Granulation tissue

What is the diagnosis of this process? Bronchiolitis obliterans organizing pneumonia-like/cryptogenic organizing pneumonia-like pattern (granulation tissue in airway and adjacent alveoli)

Answer 2. What cells are causing the thickening, and what cells predominate in the alveolar spaces? The alveolar wall thickening is caused by myofibroblasts, interstitial lymphoid cells, and type II cells. Macrophages predominate in the alveolar spaces.

What is the homogeneous pink material in the alveoli? Protein-rich edema fluid that has sufficient protein to stain with the eosin stain.

Image 2

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