Kerley lines - types

Kerley lines are named after Peter J. Kerley, a British radiologist, who identified types of septal lines on chest radiographs in patients with congestive heart failure.

Type Description
Kerley A lines linear opacities usually 2 - 6 cm long radiating from the hila into the periphery, caused by distention of lymphatic channels between perivenous and peribronchovascular lymphatics
Kerley B lines short (<2cm) thin horizontal lines extending perpendicularly from the lateral pleural surface in the lung bases, caused by thickening of interlobular septa
Kerley C lines reticular opacities in the lung bases that represent Kerley B lines en face.


1. Koga T, Fujimoto K. Kerley’s A, B, and C Lines. New England Journal of Medicine. 2009;360(15):1539–1539
2. Hodgkinson DW, O’Driscoll BR, Driscoll PA, Nicholson DA. ABC of emergency radiology. Chest radiographs--I. BMJ. 1993 Nov 6;307(6913):1202–6
3. Sekar T, Swan KG, Vietrogoski RA. A Beeline Through Sir Peter James Kerley’s Life. American Journal of Roentgenology. 2011 Apr;196(4):W375–W379.