Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size remains normal . The mediastinal and hilar contours are unchanged . Pulmonary vasculature is not engorged . Persistent ill - defined opacities within both lung bases are perhaps minimally worse in the interval with probable trace bilateral pleural effusions . No pneumothorax is detected . There are no acute osseous abnormalities . Mild degenerative changes are noted in the lower thoracic spine .
    OUTPUT:
    
Perhaps slight interval worsening of bibasilar ill - defined opacities concerning for aspiration or pneumonia . Trace bilateral pleural effusions .