CTICasesPulmonary embolism
Imaging findings
Chest radiograph shows oligemia and small vessel caliber in the right upper lobe compared to the left (Westermark sign), relative transradiancy of the right upper lobe, dilatation of the right pulmonary artery (Pala sign), and distended superior vena cava and azygos vein. Chest CT confirms large bilateral pulmonary emboli with right ventricular strain.
Key takeaways
While chest radiographs are often normal or non-specific in acute pulmonary embolism, classic findings can occasionally be seen. These include localized oligemia (Westermark sign), proximal pulmonary artery dilation (Pala sign), and systemic venous congestion from right heart strain.
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