Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . There is a trace left pleural effusion , best seen on the lateral view . There is no pneumothorax or focal airspace consolidation . Heart is normal size . There is no pulmonary edema . The aorta is tortuous . The hilar contours are unremarkable . Old right - sided rib fractures and cervical spine hardware are noted .
    OUTPUT:
    
Trace left pleural effusion .