Chest Radiology > Pathology > Pulmonary Edema > Kerley B Lines

Kerley B Lines

These are horizontal lines less than 2cm long, commonly found in the lower zone periphery.  These lines are the thickened, edematous interlobular septa.  Causes of Kerley B lines include; pulmonary edema, lymphangitis carcinomatosa and malignant lymphoma, viral and mycoplasmal pneumonia, interstital pulmonary fibrosis, pneumoconiosis, sarcoidosis.  They can be an evanescent sign on the CXR of a patient in and out of heart failure.


The patient above is suffering from congestive heart failure resulting in interstitial edema.   
Notice the Kerley's B lines in right periphery (arrows).


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