Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Midline sternotomy wires and mediastinal clips again noted . The heart is moderately enlarged and unchanged . There is mild basilar atelectasis . No convincing evidence for pneumonia or edema . No large effusion or pneumothorax . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Cardiomegaly is unchanged , mild bibasilar atelectasis , no convincing evidence for pneumonia .