Pulmonary edema and Kerley's lines

Kerley's A lines (arrows) are linear opacities extending from the periphery to the hila; they are caused by distention of anastomotic channels between peripheral and central lymphatics.
Kerley's B lines (white arrowheads) are short horizontal lines situated perpendicularly to the pleural surface at the lung base; they represent edema of the interlobular septa.
Kerley's C lines (black arrowheads) are reticular opacities at the lung base, representing Kerley's B lines en face. These radiologic signs and physical findings suggest cardiogenic pulmonary edema.

source: http://www.nejm.org/doi/full/10.1056/NEJMicm0708489

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