<prompt> All are true about Kerley B line exceptHorizontalRuns from hilar area to peripheral areaDue to thickening of septaDue to pulmonary venous hypertension  <response>: Kerleys B lines are transverse Horizontal lines at lung base. These are due to thickening of interlobar septa due to edema caused by pulmonary venous hypertension congestion as occurs in LVF or mitral stenosis. 