Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is minimal if any residual left apical pneumothorax in comparison to most recent prior radiograph . The lungs are well expanded and clear . The cardiomediastinal silhouette , hilar contours , and pleural surfaces are normal . There is no evidence of pleural effusion .
    OUTPUT:
    
Minimal , if any , residual left apical pneumothorax .