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KERLEY LINES OR SEPTAL LINES

kerley A lines: seen near Apex unbranched

Kerley 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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