While heart failure is the textbook cause, the differential diagnosis for Kerley B lines extends beyond hydrostatic pressure. They can also occur in non-cardiogenic conditions. For instance, lymphangitis carcinomatosa—a condition where tumor cells diffusely infiltrate the lymphatic vessels of the lung—can cause thickening of the septa, resulting in these lines. Similarly, pulmonary fibrosis, pneumoconiosis (lung disease caused by dust inhalation, such as silicosis), and certain viral infections can induce interstitial thickening. Therefore, while the presence of Kerley B lines strongly suggests heart failure in the acute setting, clinicians must correlate the radiographic findings with the patient’s clinical history and physical examination.
Kerley B lines are short, horizontal linear opacities seen on a chest X-ray that indicate . First described by Dr. Peter Kerley in 1933, these lines are a hallmark radiographic sign used to identify fluid accumulation or thickening within the lung's interlobular septa. Radiographic Appearance chest x ray kerley b lines
Unlike pulmonary blood vessels, which taper as they move toward the lung periphery, Kerley B lines maintain a consistent thickness and extend all the way to the pleura. Why They Form While heart failure is the textbook cause, the
In conclusion, Kerley B lines are more than mere lines on a black-and-white image; they are a physiological fingerprint of interstitial lung pathology. They exemplify the principle that radiology is not merely about seeing static structures, but about understanding dynamic processes. By recognizing these short, horizontal lines in the costophrenic angles, the clinician can diagnose pulmonary edema in its earliest interstitial stage, differentiate between cardiogenic and non-cardiogenic causes, and monitor the efficacy of treatment. As such, Peter Kerley’s discovery remains an enduring pillar of chest radiography, bridging the gap between the shadow on the film and the failing heart of the patient. First described by Dr