Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to chest radiographs from ___ , there is no significant change . Lungs are clear without focal consolidation , effusion , or pneumothorax . There is no central vascular congestion or overt pulmonary edema . Mediastinum , hila and pleural surfaces are unremarkable . Heart size is normal .
    OUTPUT:
    
No evidence of pneumonia .