Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Small Left apical pneumothorax is stable compared to 3 hr ago , measuring 1 .4 cm in depth . Nodular opacity at the left lung apex may reflect post procedural change . There is no pleural effusion . Cardiomediastinal silhouette is unchanged .
    OUTPUT:
    
Stable left apical pneumothorax compared to 3 hr ago .