Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Diffuse hazy opacification of the left lung field and right upper lung has increased slightly compared with the prior study . Pleural effusions are similar . The cardiomediastinal silhouette is unchanged . Rightward obliquity of the radiograph is similar to multiple prior studies . There is no pneumothorax .
    OUTPUT:
    
Slight interval increase in hazy opacification of the left lung and right upper lung most likely representing increased pulmonary interstitial edema . Widespread infectious process is possible in the proper clinical circumstances , but thought to be less likely .