While Kerley lines are most famously associated with congestive heart failure and pulmonary edema, they are not exclusive to those conditions. Other potential causes include: Mitral valve disease (especially mitral stenosis).
When you spot Kerley lines on a chest X-ray:
Radiographically, Kerley B lines represent fluid or cellular buildup in the peripheral interlobular septa. When the pulmonary capillary wedge pressure rises above 15–20 mmHg—often due to left-sided heart failure—fluid leaks into these spaces, making them visible on an X-ray. kerley a and b lines
“If you see Kerley B lines, think of a failing left ventricle or a tight mitral valve.”
| Feature | Description | |--------|-------------| | | Mid-to-upper lung zones, central | | Orientation | Radiating from hilum toward periphery | | Length | 2–6 cm | | Thickness | 0.5–1 mm | | Distribution | Bilateral but may be asymmetric | | Key clue | Do not touch the pleural surface | While Kerley lines are most famously associated with
In the context of heart failure, the appearance of Kerley lines often correlates with the severity of fluid overload. As a patient receives diuretic treatment and the fluid is cleared, these lines typically disappear, making them a useful marker for monitoring treatment progress.
Kerley lines from heart failure resolve with diuresis within 24–48 hours. Lymphangitic spread does not. When the pulmonary capillary wedge pressure rises above
The presence of Kerley A and B lines on a chest X-ray suggests:
Kerley A and B lines are radiological signs observed on chest X-rays, indicative of interstitial lung disease. These lines are named after the British radiologist Peter Kerley, who first described them in the 1930s. The presence of Kerley A and B lines is crucial in diagnosing and monitoring various pulmonary conditions.
While the "Kerley" terminology originated with plain-film radiography, modern CT scans provide a much more detailed view of the interlobular septal thickening. On a high-resolution CT (HRCT) scan, these lines appear as a "reticular pattern." Despite the advancement of CT technology, the chest X-ray remains the primary screening tool for identifying Kerley A and B lines due to its speed and accessibility in emergency settings.