Earliest feature of pulmonary venous hypertension is –
Cephalization of pulmonary vascularity is the first radiological sign of pulmonary venous hypertension amongst the options provided. Pulmonary venous hypertension results in diversion of blood flow from lung bases to the zipper lobes. This reversal of normal gravity dependent pattern and upper lobe venous diversion is first radiological sign.
Upper lobar vessel dilatation
Kerley B lines
Left atrial enlargement
Pleural effusion