Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung is well inflated and clear except for linear opacity at right base due to atelectasis . Right hemidiapharagm asymmetry persists unchanged . There is no pleural effusion or pneumothorax . Cardiomediastinal silhouette unchanged and normal .
    OUTPUT:
    
No sign of pneumonia , minimal atelectasis at the right lung base .