Kerley B [cracked] -

In a healthy lung, the connective tissues separating the lung’s tiny lobules (interlobular septa) are too thin to be seen on an X-ray. However, when fluid or cellular debris fills these spaces, the septa thicken and become visible as . They are characterized by:

Kerley B lines are thin, horizontal linear opacities, typically . They are found at the periphery of the lungs, specifically in the lower zones near the costophrenic angles . These lines run perpendicular to the pleural surface and extend all the way to it. kerley b

To the untrained eye, a chest X-ray is a confusing jumble of ribs, vessels, and air. However, the lung is designed to be a vessel of air, appearing dark on an X-ray due to its radiolucency. The interstitium—the complex network of connective tissue that supports the lung's air sacs—is normally invisible. It is only when this network becomes engorged that it betrays its presence. This is where the Kerley B line earns its significance. These lines appear as short, white, horizontal streaks located at the periphery of the lung, typically near the base. They are distinct, usually about one to two centimeters in length, and abut the pleura, the lining of the lung. In a healthy lung, the connective tissues separating

In CHF, Kerley B lines will often improve with diuresis (furosemide). In cancer, they persist or worsen. They are found at the periphery of the

are a classic radiological finding on chest X-rays that serve as a critical warning sign of fluid buildup in the lungs. Though they are tiny—often no longer than a postage stamp—they can signal serious conditions like congestive heart failure. What Are Kerley B Lines?

Look at the on an upright chest X-ray.

The appearance of Kerley B lines is most commonly associated with , which is the accumulation of fluid in the lung's supporting tissues. Radiopaedia