Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild to moderate cardiomegaly is re - demonstrated . Mediastinal contour is unchanged , and enlargement of the hila bilaterally is re - demonstrated , not substantially changed in the interval . There is new mild pulmonary edema . Left basilar opacity may reflect atelectasis . No pleural effusion or pneumothorax is identified . Increased sclerosis throughout the thoracic spine is compatible with renal osteodystrophy .
    OUTPUT:
    
Mild pulmonary edema . Left basilar opacity may reflect atelectasis though infection is not excluded in the correct clinical setting .