Alveolar infiltrate

infiltrates involving the air spaces which may be acute or chronic. There is an initial pattern of small, ill-defined nodules which coalesce to form areas of patchy consolidation with air bronchograms. Progression from nodular to a consolidative pattern may be rapid. The commonest cause of acute opacification is infection. Oedema, aspiration, obstructive pneumonitis, and eosinophilic infiltrates are also seen. Chronic infiltrates may also be due to infection. Aspiration and alveolar proteinosis may also cause chronic changes. Also, see airspace disease.

Causes of acute alveolar infiltrate:

1-Acute pulmonary edema.

2-Pneumonia.

3-Aspiration.

4-Pulmonary hemorrhage.

Aspiration Pneumonia:

Acute Pulmonary Edema:

Bat-wing appearance of acute pulmonary edema.