What is the radiological sign demonstrated in the image?
Hint: The region focussed is the right cardiophrenic angle on a Chest X-ray PA View in a person with a valvular heart disease.
They are Kerley B lines, classically seen in mitral stenosis.
Kerley B lines are horizontal lines seen mostly near the costophrenic angles. These lines are due to thickened interlobular septa.Kerley A lines are linear opacities radiating from the hila to the periphery, thought to be distended lymphatic channels.
Kerley C lines are reticular pattern of opacities in the basal regions, possibly representing end on views of Kerley B lines.