Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been little interval change from the prior exam . The heart size is normal . The mediastinal and hilar contours are within normal limits . The pulmonary vascularity is normal without evidence of pulmonary edema . Again noted are bilateral ill - defined hazy airspace opacities predominantly within a perihilar distribution , not significantly changed in extent compared to the recent chest radiograph and chest CT . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
No significant interval change in bilateral predominantly perihilar ill - defined airspace opacities which may reflect a multifocal infectious process , but is nonspecific .