Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are normal . Pulmonary vascularity is normal . Lungs are clear . Blunting of the left costophrenic sulcus on the frontal view suggests a trace left pleural effusion . No pneumothorax is seen . No displaced rib fractures are identified .
    OUTPUT:
    
Small left pleural effusion . No displaced rib fractures are noted . If there is continued clinical concern for a rib fracture , then a dedicated rib series is recommended .