Kerley B lines on CT
Presents with shortness of breath and atrial fibrillation. D-dimer +ve, ? PE
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Linear interstitial lines in the lung periphery = Kerley B lines (actually fluid in the interlobular septa) due to mild pulmonary oedema. Note the very big heart.
Always look at the lungs on a CTPA as it may provide the cause of breathlessness other than PE!