Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . The heart is normal in size . The chest is hyperinflated . Minimal opacity at the right base is probably due to minor atelectasis . There is a new medial left posterior basilar opacity and possible a small pleural effusion . Mild loss in height of a mid thoracic vertebral body appears chronic and unchanged .
    OUTPUT:
    
Medial left basilar opacity , which could be seen with pneumonia , although atelectasis is possible ; suspected trace coinciding effusion .