Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . Top - normal heart size is similar to prior . Mediastinal contours , including engorgement of the vascular pedicle , are stable . Pulmonary vascular markings are indistinct , consistent with mild pulmonary edema . Small retrocardiac opacity may represent either atelectasis or consolidation . No pneumothorax or large pleural effusion .
    OUTPUT:
    
Mild pulmonary edema with retrocardiac opacity , either atelectasis or infection .