What Are Kerley B Lines Jun 2026

are small, thin, horizontal lines seen at the very edges (costophrenic angles) of the lungs on a standard chest X-ray. They are a direct sign of interstitial pulmonary edema (fluid in the lung tissue itself), most commonly caused by congestive heart failure, but also by other diseases that scar or inflame the lung's support structure.

The presence of Kerley B lines on a chest radiograph is significant, as it indicates the presence of interstitial edema. This finding can: what are kerley b lines

They are perpendicular to the pleural surface (the outer edge of the lung) and extend directly out to contact it. Pattern: They are typically parallel to one another. Clinical Significance and Causes are small, thin, horizontal lines seen at the