Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Cardiomediastinal silhouette and hilar contours are normal . Lungs are clear . No pleural effusion . Small left apical pneumothorax . Suggestion of left hemidiaphragmatic flattening .
    OUTPUT:
    
Small left apical pneumothorax . Short - term followup examination is recommended given left hemidiaphragmatic finding .