Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate clear lungs . Opacity at the left base likely reflects minimal atelectasis . There is no pleural effusion , or pneumothorax . The cardiac silhouette is top normal in size , the mediastinal contours are unchanged . Median sternotomy wires remain in place .
    OUTPUT:
    
Clear , well - expanded lungs with the exception of minimal left greater than right basilar atelectasis .