Westermark sign

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Frequently seen with Palla’s sign

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![Examination carried out on day before death from pulmonary embolism. Of note is anaemia of the entire right lung, particularly well marked in its upper lobe and in left upper lobe. The vascular design seems to end abruptly in the central parts of the lung.

Westermark N. On the Roentgen Diagnosis of Lung Embolism. Acta Radiologica. 1938;Original Series, Volume 19(4):357-372. doi:https://doi.org/10.1177/028418513801900405](attachment:76ac2c91-5e1b-4973-a73f-a1e086196bd3:Westermark-sign-1938-Case-2.png)

Examination carried out on day before death from pulmonary embolism. Of note is anaemia of the entire right lung, particularly well marked in its upper lobe and in left upper lobe. The vascular design seems to end abruptly in the central parts of the lung.

Westermark N. On the Roentgen Diagnosis of Lung Embolism. Acta Radiologica. 1938;Original Series, Volume 19(4):357-372. doi:https://doi.org/10.1177/028418513801900405

![67-year-old female presented with chest pain and was diagnosed with pulmonary thromboembolism. CECT scan of chest in the lung window shows lucency (white arrow) indicating oligemia distal to the occluded pulmonary artery, and thus represents the radiologic sign, Westermark sign.

Kumaresh A, Kumar M, Dev B, Gorantla R, Sai PV, Thanasekaraan V. Back to Basics - 'Must Know' Classical Signs in Thoracic Radiology. J Clin Imaging Sci. 2015;5:43. Published 2015 Jul 31. doi:10.4103/2156-7514.161977](attachment:fc164034-4048-4bdc-bb6a-40602461b45d:JCIS-5-43-g027.jpg)

67-year-old female presented with chest pain and was diagnosed with pulmonary thromboembolism. CECT scan of chest in the lung window shows lucency (white arrow) indicating oligemia distal to the occluded pulmonary artery, and thus represents the radiologic sign, Westermark sign.

Other CXR signs: