Radiographic Signs of Thromboembolism

Figure 1. Westermark's Sign

Frontal chest radiograph shows enlargement of the left hilum accompanied by left lung hyperlucency, indicating oligemia (Westermark's sign).


Figure 2. Oligemia

Frontal chest radiograph in a patient with acute onset hypoxemia following surgery shows diffuse, decreased attenuation throughout the right lung, consistent with oligemia secondary to acute pulmonary embolism.

Figure 3. Pulmonary Infarction

Frontal chest radiograph shows wedge-shaped, subpleural consolidation (Hampton's hump) in the right lower lobe, due to pulmonary infarction. An embolus occluding the right pulmonary artery was shown at CT.

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