Narrowing of the mitral valve restricts blood flow, raising venous pressure. 2. Pulmonary and Lymphatic Conditions

Kerly B Lines, also known as Kerley B lines or Kerley's B lines, are a radiological sign seen on chest X-rays. They are a type of short, horizontal line at the lung periphery, typically seen in conditions that cause interstitial lung disease or pulmonary edema.

Here is what you need to know about these thin white lines, what they represent, and why getting the name right is more than just academic pedantry.

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Serial X-rays show the lines disappearing as fluid clears. Persistent lines suggest permanent fibrosis or malignancy.

Kerley B lines are small, thin, horizontal lines visible near the outer edges of the lungs on a chest X-ray. They are typically less than 2 cm long, run perpendicular to the pleural surface (the lining of the lung), and are most commonly found in the costophrenic angles—the lowest corners of the lungs near the ribs and diaphragm.

Dr. Kerley actually described three types of lines, though "B" is by far the most famous and clinically useful: