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![Subtle chest x-ray signs of pulmonary thromboembolism: the Palla's and Westermark's signs | Postgraduate Medical Journal Subtle chest x-ray signs of pulmonary thromboembolism: the Palla's and Westermark's signs | Postgraduate Medical Journal](https://pmj.bmj.com/content/postgradmedj/89/1050/241/F4.large.jpg)
Subtle chest x-ray signs of pulmonary thromboembolism: the Palla's and Westermark's signs | Postgraduate Medical Journal
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Hampton's hump, Westermark's sign and Palla's sign in acute pulmonary thromboembolism: a rare concurrence | BMJ Case Reports
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