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A 45-year-old man with a past case of left-sided croupous pneumonia died of multiple trauma in a traffic accident. Autopsy shows that the posteriolateral wall of the lower left pulmonary lobe is fused to the chest wall with fibrous commissures. The lobe is shrunken, dense, pink-gray. It has meat-like appearance on section and its pieces sink in the water. Histology shows diffuse proliferation of fibrous connective tissue in these areas. What complication of croupous pneumonia is it?