Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison with chest radiograph from ___ , a small left apical pneumothorax is grossly unchanged . Lungs are otherwise clear without focal consolidation or pleural effusion . Cardiomediastinal silhouette is normal . Pulmonary vasculature is normal . There are no acute osseous abnormalities .
    OUTPUT:
    
Unchanged small left apical pneumothorax .