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What are the three main signs of pulmonary embolism on a CXR?
Wedge shaped opacity (coagulative necrosis)
Decreased vascularization at periphery causing darkened appearance (oligaemia)
Enlarged pulmonary artery
Describe the findings
Filling defect seen in the right pulmonary artery
Dilated pulmonary trunk (pulmonary hypertension)
Saddle shaped embolism
Describe the findings
Mosaic pattern from attenuation variations
Differences in segment vessel size
How can chronic PE be differentiated from acute PE?
Filling defect forming an obtuse angle with vessel wall
Collateral vessels around descending aorta
Bronchial artery dilation