Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Small left apical pneumothorax is stable . Suggestion of left hemidiaphragmatic flattening is stable . Mild biapical pleural thickening is seen . No focal consolidation is seen . No pleural effusion . Cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Stable small left apical pneumothorax .