Histologic Changes

The alveolar parenchyma shows enlarged air spaces with walls that are widened by edematous connective tissue. Cuboid to flat alveolar lining cells are more prominent than normal.

Small, centrally-placed, blood-filled veins are present, but capillaries, which make contact with the alveolar lining cells, are markedly decreased. Thick-walled arterioles (arrows) accompany the thin-walled venous channels.

Clinical summary Image 3

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