Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Aside from left lower lobe atelectasis , lungs are clear . The hilar and cardiomediastinal contours are normal . There is no pneumothorax . Again noted is blunting of the posterior costophrenic angles suggestive of pleural thickening or chronic effusions . Pulmonary vascularity is normal .
    OUTPUT:
    
No acute cardiopulmonary process .