Kerley A lines are less common than B lines but indicate a similar underlying pathology. These lines are longer (2 cm to 6 cm) and radiate from the hila (the central part of the lung) toward the periphery. They do not reach the edge of the lung like B lines do.
For clinicians and radiologists, recognizing Kerley A and B lines is critical. They often appear before the more dramatic signs of alveolar edema (like bat-wing opacities) and can point toward elevated left atrial pressure, even in a relatively stable patient. This post breaks down the anatomy, pathophysiology, radiographic appearance, and clinical significance of these two classic signs. kerley a and b lines
When interpreting Kerley A and B lines, consider the following differential diagnoses: Kerley A lines are less common than B