Pulmonary embolism

Chest x-ray signs (CXR) in pulmonary embolism- 
 

• Westermark sign: Focal oligemia (decreased blood flow) distal to the embolus.
 

• Hampton’s hump: A wedge-shaped, pleural-based opacity with the base against the pleura, indicative of pulmonary infarction.
 

• Palla’s / Knuckle sign: Enlarged right descending pulmonary artery.
 

• Elevated Hemidiaphragm: Due to atelectasis or pleural effusion.
 

• Chang sign: Abrupt tapering or cutoff of a pulmonary artery.
 

• Fleishner’s sign: Enlarged pulmonary artery 

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