Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright chest radiograph demonstrates bibasilar opacity likely reflecting atelectasis with superimposed mild lower lobe edema , worse on the right . Small bilateral effusions may be present , but this is incompletely evaluated without a lateral view . The cardiac silhouette is unchanged and normal in size . There are post-surgical changes of median sternotomy and CABG . Mediastinal contours are normal . A left chest pacemaker with atrial and ventricular leads is unchanged in appearance . The pulmonary vasculature is normal .
    OUTPUT:
    
Bibasilar opacities likely reflect mild CHF .