Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without focal consolidation . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable . Mild pectus excavatum .
    OUTPUT:
    
Lungs are clear , correlate with previous study which was not available at the time of this study . Mild pectus excavatum .