Earliest radiological sign of pulmonary venous hypeension in chest X-ray is -
Upper lobe venous diversion is the 1st radiological sign of PVH. Kerley B lines , perihilar haze ,peribronchial cuffing,pulmonary ossicles,fine punctate calcification and perihilar wing pattern.
Cephalization of pulmonary vascularity
Pleural effusion
Kerley B lines
Alveolar pulmonary edema
Cardiovascular system