Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes with bilateral diffuse lung opacities , overall improved compared to the prior radiograph . Left - sided PICC terminates in the SVC . Stable cardiomegaly . No pleural effusion or pneumothorax . Unchanged bony thorax .
    OUTPUT:
    
Bilateral diffuse lung opacities , likely interstitial edema or multifocal atypical pneumonia with interval improvement compared to ___ .