Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest show a left apical pleural pigtail catheter unchanged in position . A 1 - cm left apical pneumothorax is unchanged in size or distribution . Otherwise , the lungs are clear without focal consolidation or pleural effusion . The inspiratory lung volumes are appropriate . The cardiac silhouette is normal in size . The mediastinal and hilar contours are within normal limits .
    OUTPUT:
    
Stable 1 - cm left apical pneumothorax .