Kerley B lines

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In chest radiology, Kerley B lines are a sign seen with interstitial pulmonary edema. Often, they suggest the diagnosis of congestive heart failure, but are also seen in various non-cardiac conditions such as carcinomatous of the lung.

Kerley B lines are short horizontal lines at the lung periphery. These lines represent interlobular septal lines, which are usually less than 1 cm in length and parallel to one another at right angles to the pleura. They are located perpherally in contact with the pleura, but are generally absent along fissural surface. They may be seen in any zone but are most frequently observed at the lung bases.