Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright chest radiograph was obtained . The lungs are well expanded with increased interstitial markings which could reflect mild pulmonary edema or atypical infection . Trace pleural effusion may be present on the right . The heart is normal in size with normal cardiomediastinal contours .
    OUTPUT:
    
Increase interstitial markings could reflect an atypical infection or mild pulmonary edema .