They are named after the Irish neurologist and radiologist (1900–1979), who first described them in the 1930s as a sign of lymphatic congestion in the lungs. How Do They Form? The lungs are not just air sacs; they are interlaced with a network of tiny lymphatic vessels and connective tissue (interstitium). Kerley B lines represent thickening of the interlobular septa —the tiny fibrous walls that separate the lung’s lobules.
Here is what you need to know about these thin white lines, what they represent, and why getting the name right is more than just academic pedantry. Kerley B lines are small, thin, horizontal lines visible near the outer edges of the lungs on a chest X-ray. They are typically less than 2 cm long, run perpendicular to the pleural surface (the lining of the lung), and are most commonly found in the costophrenic angles—the lowest corners of the lungs near the ribs and diaphragm. kerly b lines
In the fast-paced world of emergency medicine and radiology, few signs are as fleeting—or as critical—as Kerley B lines. Often misspelled as “Kerly B lines” due to the subtlety of the name, these tiny radiographic abnormalities are anything but trivial. When a radiologist spots them on a chest X-ray, it often triggers an immediate change in a patient’s diagnosis and treatment plan. They are named after the Irish neurologist and