Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate stable top normal heart size . The mediastinal and hilar contours are within normal limits . An ill defined area of opacity projecting over the right upper lung may represent pleural versus parenchymal abnormality , but is unchanged since ___ , longstadning . There is no definite consolidation , pleural effusion , or pulmonary vascular congestion .
    OUTPUT:
    
1 . No evidence of congestive heart failure . 2 . Vague opacity projecting over right upper lung is unchanged since ___ , which may reflect chronic pleural versus parenchymal abnormalities .