Kerley B lines seen in: (A) Pulmonary embolism, (B) Pulmonary edema, (C) Carcinoma bronchus, (D) Lung abscess
Answer is B. 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.