Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . There is no focal consolidation to suggest pneumonia . Cardiac silhouette is enlarged ; however , there are no findings of heart failure . There is no definite pleural effusion . No pneumothorax is seen . Patchy opacities are seen at the left lung base and are unchanged , likely representing atelectasis . Mediastinal contours and sternotomy wires are unchanged .
    OUTPUT:
    
No acute cardiopulmonary process .