Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are normal . Right lower lobe opacity is unchanged , otherwise The lungs are clear . There is no pneumothorax . Blunting of the posterior CP angle on the left could be scarring or pleural effusion . . The osseous structures are unremarkable
    OUTPUT:
    
No acute cardiopulmonary abnormalities . Questionable small left pleural effusion