Infarct

Figure 1. Recent Infarct: This acute infarct was caused by emboli in small peripheral vessels. Note the central, necrotic, hemorrhagic area, as well as the surrounding area of capillary congestion, hemorrhage, and alveolar edema.

infarctembolus1embolus2

 

It is likely that the radiographic opacity would include both the infarct and the surrounding hemorrhage/edema. Rapid clearing of the surrounding reaction, but not the infarct, would be expected to occur.

Find the embolus-occluded arteries. What is occluding them?

Find the hemorrhagic infarct.

Note also that the pleura is not necrotic. Although infarcts usually cause pleuritis, they do not cause infarction of the pleura.

scar

Figure 2. Healed Infarct

This slice of lung shows a linear, subpleural scar with retraction of the overlying pleura, typical of a healed infarct.

Find the linear scar.

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Recent hemorrhagic infarct

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Embolus-occluded artery. The embolic material in this case is tumor.

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Linear scar of healed infarct

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