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Uptodate Reference Title
Chest radiograph and CT of the Westermark sign
Chest radiograph and CT of the Westermark sign
Westermark sign in a patient with occlusive pulmonary embolism. (A) Chest radiograph magnified A-P view shows a region of oligemia in the left lower lung (asterisk). (B) Chest CT shows a large thrombus in the left main pulmonary artery (arrow).