Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since prior study from ___ , there has been no large interval change in the appearance of the chest . Cardiac silhouette is within normal limits . Mediastinal contours normal . Slight blunting of the right costophrenic angle , likely representing a small effusion . There is no overt pulmonary edema . No acute osseous abnormalities seen .
    OUTPUT:
    
No radiographic evidence of pneumonia .