Kerley B lines seen in
Pulmonary embolism
Pulmonary edema
Carcinoma bronchus
Lung abscess
In pulmonary edema,the vascularity of the lung fields becomes more prominent,and the right and left pulmonary aeries dilate.Subsequently,interstitial edema causes thickened interlobular septa and dilated lymphatics.These are evident as horizontal lines in the costophrenic angles(septal or Kerley B lines). <reference:Davidson' s medicine-22nd edition page no:550.
Respiratory system