New linear opacities in the right upper and lower lobes, likely representing atelectasis. Increased opacification of the retrocardiac airspace and blunting of bilateral costophrenic angles, which may indicate small bilateral pleural effusions. The retrocardiac opacity could be due to atelectasis, but infection cannot be excluded.
Simple pleural effusion (Uncertain) Atelectasis (Present) Pneumonia (Uncertain)