Kerley B lines seen in
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.
Pulmonary embolism
Pulmonary edema
Carcinoma bronchus
Lung abscess
Respiratory system