The human lung is organized into secondary pulmonary lobules. These lobules are separated by thin connective tissue walls called , which contain pulmonary capillaries, lymphatics, and interstitial fluid.
This fluid engorgement causes the septa to stand out as distinct, sharp linear opacities on a CXR. Radiographic Appearance of Kerley B Lines
: Short, sharp, thin lines, typically 1–2 cm in length.
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Kerley B lines are short, horizontal linear opacities seen on a chest X-ray (CXR) that indicate . They represent thickened interlobular septa, most often caused by fluid accumulation from congestive heart failure. Key Characteristics on CXR
When fluid or cells fill these small spaces, the interlobular septa thicken.
"Bilateral, symmetric Kerley B lines in the lower zones with mild cardiomegaly and perihilar haze. Findings consistent with interstitial pulmonary edema, likely due to congestive heart failure. No alveolar consolidation or pleural effusion identified at this time."
While classically associated with fluid overload, they can occur in various conditions:
