Kerley B lines are short, parallel peripheral lines on a chest X-ray that indicate a thickening of the interlobular septa in the lungs. They are one of the most reliable radiographic signs of pulmonary edema and provide critical clues for diagnosing congestive heart failure.
Pneumoconiosis: Occupational lung diseases caused by inhaling mineral dusts. Kerley B vs. Kerley A and C Lines
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Kerley B Lines: Radiographic Harbingers of Pulmonary Interstitial Edema
Chest radiography remains one of the most fundamental diagnostic tools in modern medicine, offering a non-invasive window into the cardiopulmonary system. Among the various radiographic signs that clinicians are trained to recognize, Kerley B lines stand out as a critical, specific indicator of pulmonary pathology. Named after the Irish radiologist Peter Kerley, these distinct linear opacities are synonymous with interstitial fluid accumulation. Their presence on a chest X-ray is often a pivotal finding, signaling the early stages of pulmonary edema or other interstitial lung diseases. Understanding the etymology, anatomical basis, differential diagnosis, and clinical significance of Kerley B lines is essential for any healthcare provider evaluating a patient with dyspnea or cardiac dysfunction. Kerley B lines are short, parallel peripheral lines
Detection typically prompts immediate clinical actions, such as:
To fully appreciate the significance of Kerley B lines, one must first understand the anatomy of the lung interstitium. The lung is composed of air-filled alveoli and a network of supporting tissue called the interstitium, which contains blood vessels, lymphatics, and connective tissue. Specifically, the interlobular septa are the connective tissue walls that separate the secondary pulmonary lobules—the functional units of the lung. These septa contain pulmonary veins and lymphatic channels. Kerley B vs
Kerley B lines are short, horizontal lines at the lung periphery, seen at the end of the pulmonary lobules, typically near the costophrenic angle. They represent interstitial edema or fibrosis.
Kerley B lines can be caused by various conditions, including:
Kerley A Lines: Longer (up to 6 cm) unbranching lines that radiate from the hila toward the periphery. They represent distension of anastomotic lymphatics.