Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The tracheostomy tube is visualized . There is atelectasis at the left lung base . Otherwise , the lungs are free of focal consolidations , pleural effusions or pneumothorax . Cardiomediastinal silhouette remains enlarged . Cholecystectomy clips are noted in the right upper quadrant . No acute osseous abnormalities are identified .
    OUTPUT:
    
No evidence of pneumonia .