Kerley A lines (longer, branching lines radiating from the hilum toward the upper lobes) indicate more central interstitial edema, while Kerley B lines are peripheral and more commonly identified.
Radiologists identify Kerley B lines based on four distinct characteristics: kerley b lines definition
To understand why these lines appear, one must look at the structure of the lung. The lungs are divided into secondary pulmonary lobules. These lobules are separated by interlobular septa, which contain lymphatic vessels and pulmonary veins. Kerley A lines (longer, branching lines radiating from
Narrowing of the heart valve causing chronic pressure. These lobules are separated by interlobular septa, which
Normally, the interlobular septa are too thin to be seen on a standard chest X-ray. Kerley B lines become visible when these septa undergo structural changes. The primary causes include:
Perpendicular to the pleural surface (horizontal). Size: Usually 1–2 cm long and very thin (less than 1 mm). Position: They touch the edge of the rib cage (the pleura). Common Causes
The most common cause due to fluid backup.
Kerley A lines (longer, branching lines radiating from the hilum toward the upper lobes) indicate more central interstitial edema, while Kerley B lines are peripheral and more commonly identified.
Radiologists identify Kerley B lines based on four distinct characteristics:
To understand why these lines appear, one must look at the structure of the lung. The lungs are divided into secondary pulmonary lobules. These lobules are separated by interlobular septa, which contain lymphatic vessels and pulmonary veins.
Narrowing of the heart valve causing chronic pressure.
Normally, the interlobular septa are too thin to be seen on a standard chest X-ray. Kerley B lines become visible when these septa undergo structural changes. The primary causes include:
Perpendicular to the pleural surface (horizontal). Size: Usually 1–2 cm long and very thin (less than 1 mm). Position: They touch the edge of the rib cage (the pleura). Common Causes
The most common cause due to fluid backup.