Cxr Kerley B Lines

On a standard Posteroanterior (PA) or Anteroposterior (AP) chest X-ray, Kerley B lines have distinct characteristics that differentiate them from other linear densities (such as blood vessels or scarring).

Kerley B lines are short, thin, horizontal opacities visible in the periphery of the lungs. Anatomically, they represent the —the connective tissue planes that separate the secondary lobules of the lung. When these septa become engorged with fluid, cells, or fibrous tissue, they become visible on a radiograph. Key Characteristics: Length: Typically 1–2 cm. Thickness: Usually less than 1 mm. cxr kerley b lines