Earliest feature of pulmonary venous hypeension is -: (A) Upper lobar vessel dilatation, (B) Kerley B Lines, (C) Left atrial enlargement, (D) Pleural effusion
Answer is A. Upper lobe venous diversion is the 1st radiological sign of pulmonary venous hypeension.Kerley B Lines , perihilar haze ,peribronchial cuffing,pumonary ossicles ,fine punctuate calcification and perihilar batwing pattern are the other features seen in PVH.