Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are stable . There is increased retrocardiac density compared to the prior study which suggests atelectasis however infection should be considered . There are no large pleural effusions identified . Scattered pulmonary opacities are seen throughout the bilateral lungs which may be related to persistent edema or a chronic interstitial process . No pneumothorax is identified . Pleural calcifications are seen and are unchanged from the most recent prior study .
    OUTPUT:
    
Increased retrocardiac opacity suggesting atelectasis or infection in the appropriate setting . Persistent bilateral airspace opacities likely reflect pulmonary edema however underlying interstitial process can not be excluded . No pneumothorax .