kerley A lines: seen near Apex unbranchedKerley B lines: seen at the base and unbranched
Kerley C lines : seen in Central and perihilar region
Most common are Kerley b lines
Kerley b lines are found in pulmonary venous hypertension
And in conditions causing dilated lymphatics eg: lymphangitis carcinomatosis, MS ,LVF , Interstial lung diseases.
Image courtesy : www.radiopedia.org
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