Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is top normal . Mediastinal and hilar contours are unchanged with a moderate size hiatal hernia again noted . Pulmonary vasculature is not engorged . Lung volumes are low with a patchy opacity seen seen in the left lower lobe , potentially atelectasis however infection or aspiration can not be excluded . Minimal blunting of the left costophrenic sulcus may suggest a trace pleural effusion . No pneumothorax is present . Remote right - sided rib fractures and right mid clavicular fracture are noted . Clips are seen in the retrocardiac space corresponding with a hiatal hernia , as seen on prior chest CT from ___ .
    OUTPUT:
    
Left lower lobe patchy opacity , potentially atelectasis , however infection or aspiration can not be excluded . Possible trace left pleural effusion .