Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are within normal limits . The pulmonary vasculature is not engorged . Patchy opacities are noted in the lung bases , present on the previous examinations , perhaps worse when compared to the most recent chest radiograph . These findings may reflect atelectasis and / or recurrent aspiration pneumonia . No pleural effusion or pneumothorax is demonstrated . No acute osseous abnormality is seen .
    OUTPUT:
    
Patchy bibasilar airspace opacities may be perhaps worse when compared to the most recent chest radiograph . These findings may reflect atelectasis and / or recurrent aspiration pneumonia .