Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The hilar and mediastinal contours are within normal limits . There is no pneumothorax , focal consolidation , or pleural effusion . The lungs are hyperexpanded , with increased lucency in the upper zones , compatible with COPD . Mild dextroscoliosis is centered about the thoracic spine . Bibasilar opacities appear more prominent .
    OUTPUT:
    
No acute intrathoracic process . However , slightly increased bibasilar density warrants further evaluation with CT if fevers persist or worsen .