Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to prior CT torso , previously noted right pneumothorax is not visualized on this examination . The cardiomediastinal and hilar contours are within normal limits . Lung volumes are decreased . There is no focal consolidation or pleural effusion . Nondisplaced rib fractures seen on outside CT are not identified in this examination .
    OUTPUT:
    
No definite pneumothorax .