Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate no focal areas of consolidation . Scarring at the left lung apex is unchanged . A double contour on chest x-ray in the left lower lung represents mediastinal fat . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is unchanged .
    OUTPUT:
    
No evidence of pneumonia .