![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?download=true)
Subtle chest x-ray signs of pulmonary thromboembolism: the Palla's and Westermark's signs | Postgraduate Medical Journal
![Westermark's and Palla's signs in acute and chronic pulmonary embolism: Still valid in the current computed tomography era Brenes-Salazar JA - J Emerg Trauma Shock Westermark's and Palla's signs in acute and chronic pulmonary embolism: Still valid in the current computed tomography era Brenes-Salazar JA - J Emerg Trauma Shock](https://www.onlinejets.org/articles/2014/7/1/images/JEmergTraumaShock_2014_7_1_57_125645_f1.jpg)
Westermark's and Palla's signs in acute and chronic pulmonary embolism: Still valid in the current computed tomography era Brenes-Salazar JA - J Emerg Trauma Shock
![Chest X-ray showing a mass in the left upper lung field (Palla's sign). | Download Scientific Diagram Chest X-ray showing a mass in the left upper lung field (Palla's sign). | Download Scientific Diagram](https://www.researchgate.net/publication/236255497/figure/fig3/AS:1088972524666896@1636642690687/Chest-X-ray-showing-a-mass-in-the-left-upper-lung-field-Pallas-sign.jpg)