Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left - sided pneumothorax has resolved . The left lower lobe has re-expanded . The lungs are clear . There is no pleural effusion . The cardiomediastinal silhouette is within normal limits . Mild irregularity along the lateral aspect of the left fourth through sixth ribs are consistent with recent known rib fractures and are unchanged in appearance since the prior study . No displaced rib fractures are noted . Evaluation is limited without a dedicated rib series .
    OUTPUT:
    
1 . Resolution of left - sided pneumothorax and reexpansion of the left lower lobe . 2 . Stable appearance of nondisplaced left rib fractures .