Kerley B lines represent the visualization of interlobular septa that have become thickened. In a healthy lung, these septa are too thin to be seen on a standard X-ray. They become visible when they are distended by fluid or infiltrated by cells or fibrous tissue.
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Note: There are also Kerley A lines (longer lines deep in the lung parenchyma) and Kerley C lines (a network of fine lines), but Kerley B lines are the most frequently identified and clinically useful of the three. Kerley B lines represent the visualization of interlobular
: Short, sharp, thin lines, typically 1–2 cm in length. a patient report