Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , accounting for bronchovascular crowding . Patchy opacities are seen in the retrocardiac region . Otherwise the remaining lung fields are clear . Upper vascular redistribution suggests mild vascular congestion . There is no pleural effusion or pneumothorax . Heart size is normal . No rib fractures are identified .
    OUTPUT:
    
1 . Retrocardiac opacities are concerning for infectious / inflammatory process , versus atelectasis or inflammed airways , accompanied by suspected vascular congestion . 2 . No rib fractures identified . However if there is further clinical concern dedicated rib views should be obtained as this study is suboptimal for the detection of rib fractures .