Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear opacities are present in the left lower lung zone , likely reflective of atelectasis . No focal consolidation , pleural effusion or pneumothorax identified . The size of the cardiomediastinal silhouette is within normal limits . Note is made of free air under both hemidiaphragms , presumed to be secondary to the recent PEG tube placement .
    OUTPUT:
    
Left basilar atelectasis . Free air under both hemidiaphragms , presumed to be secondary to the recent PEG tube placement .