Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . No pleural effusion or pneumothorax . Suggestion of some coalescence of opacification at the bases could merely represent atelectasis and scatter radiation related to the size of the patient , but in the appropriate clinical setting , pneumonia could be considered .
    OUTPUT:
    
1 . No evidence of TB . 2 . Bibasilar opacification could be atelectasis , scatter radiation , or possibly pneumonia in the appropriate clinical setting .