Answer: Images 5A & B. These two photos are representative of most of the lung parenchyma. What has happened since the lung biopsy was taken? The organizing interstitial pneumonia has resolved.

Which photo appears abnormal? Image 5B is abnormal.

What are the abnormalities? Image 5B shows focal collapse and overdistension of alveoli, both of which distort the architecture. Most airways (bottom edge) are unremarkable, and vessels (not shown) were normal.

How do you account for lung weights that were more than double normal? The increased weight is from edema, which is transudative, in the interstitium and air spaces. It cannot be seen in the sections because it has insufficient protein to stain with the eosin stain.

Image 5

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