<prompt> Kerley B line are seen atApexCardiophrenic angleLung fissurePleural surface  <response>: Ans. is d i.e., Pleural surface Kerleys line Kerleys line is a linear opacity which, depending on its locaton, extent and orientation, may be be fuher classified as :? Kerleys 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. Kerleys 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. Kerleys 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 