The pathophysiology behind these lines is a narrative of fluid overload and lymphatic obstruction. The most common etiology is pulmonary edema, predominantly cardiogenic in nature. In left-sided heart failure, the left ventricle fails to effectively pump blood into the systemic circulation, causing a backlog of blood into the pulmonary vasculature. This increases the hydrostatic pressure within the pulmonary capillaries, forcing fluid out of the vessels and into the interstitial space. As the interlobular septa become engorged with fluid and the lymphatics become distended, they become radiopaque (white) against the dark background of the aerated lung, creating the appearance of Kerley B lines. In this context, they are a hallmark of interstitial edema, often preceding the development of alveolar edema, where fluid spills into the air sacs themselves.
: Such as pulmonary fibrosis or sarcoidosis. Pneumonia : Viral or mycoplasma infections. Clinical Context
On a chest radiograph, Kerley B lines have distinct characteristics that differentiate them from normal lung structures:
: They run perpendicular to the pleural surface (the lung's outer lining) and extend out to meet the lung's edge. Common Causes
Kerley B lines are a classic sign on a chest X-ray that indicate , or the accumulation of fluid in the lungs' interstitial space . Named after Peter Kerley, these lines represent the thickening of the interlobular septa—the thin walls that separate the lung lobules. Key Characteristics Appearance : Short, thin, horizontal white lines.
The lungs are divided into small units called secondary pulmonary lobules, which are separated by . These septa contain connective tissue, lymphatics, and small veins. Under normal conditions, they are too thin to be seen on an X-ray. However, when the pulmonary capillary wedge pressure (PCWP) reaches roughly 20–25 mmHg , fluid begins to leak into these spaces. This engorgement makes the septa visible as "lines". Clinical Significance and Causes
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The pathophysiology behind these lines is a narrative of fluid overload and lymphatic obstruction. The most common etiology is pulmonary edema, predominantly cardiogenic in nature. In left-sided heart failure, the left ventricle fails to effectively pump blood into the systemic circulation, causing a backlog of blood into the pulmonary vasculature. This increases the hydrostatic pressure within the pulmonary capillaries, forcing fluid out of the vessels and into the interstitial space. As the interlobular septa become engorged with fluid and the lymphatics become distended, they become radiopaque (white) against the dark background of the aerated lung, creating the appearance of Kerley B lines. In this context, they are a hallmark of interstitial edema, often preceding the development of alveolar edema, where fluid spills into the air sacs themselves.
: Such as pulmonary fibrosis or sarcoidosis. Pneumonia : Viral or mycoplasma infections. Clinical Context
On a chest radiograph, Kerley B lines have distinct characteristics that differentiate them from normal lung structures:
: They run perpendicular to the pleural surface (the lung's outer lining) and extend out to meet the lung's edge. Common Causes
Kerley B lines are a classic sign on a chest X-ray that indicate , or the accumulation of fluid in the lungs' interstitial space . Named after Peter Kerley, these lines represent the thickening of the interlobular septa—the thin walls that separate the lung lobules. Key Characteristics Appearance : Short, thin, horizontal white lines.
The lungs are divided into small units called secondary pulmonary lobules, which are separated by . These septa contain connective tissue, lymphatics, and small veins. Under normal conditions, they are too thin to be seen on an X-ray. However, when the pulmonary capillary wedge pressure (PCWP) reaches roughly 20–25 mmHg , fluid begins to leak into these spaces. This engorgement makes the septa visible as "lines". Clinical Significance and Causes
























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