Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is moderately enlarged the aorta is unfolded . There are atherosclerotic calcifications of the aortic knob . Mild pulmonary edema is demonstrated with vascular indistinctness and perihilar haziness . There is blunting of the left costophrenic angle which could suggest a trace left pleural effusion . Patchy retrocardiac opacity likely reflects atelectasis . No pneumothorax is demonstrated . There are moderate multilevel degenerative changes in the thoracic spine .
    OUTPUT:
    
Mild pulmonary edema with possible trace left pleural effusion . Retrocardiac atelectasis .