Kerley B line are seen at

Ans. is 'd' i.e., Pleural surface Kerley's line Kerley's line is a linear opacity which, depending on its locaton, extent and orientation, may be be fuher classified as :? Kerley's A lines o These are thin, non-branching lines radiating from hilum. These lines are 2-6 cm in length. These lines are found in the mid and upper zones of the lung fields pleural. These lines are due to the thick interlobar septa. Kerley's B lines (septal lines) These are transverse (Horizontal) lines at the lung base pleural. These are 1-2 cm in length and are perpendicular to pleura. Kerley's B line is due to the thickening of interlobar septa due to edema caused by pulmonary venous hypeension (congestion), as occurs in left ventricular failure or mitral stenosis