Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top normal . The mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . Patchy opacity in the left lower lobe most likely reflects atelectasis . A small left pleural effusion is likely present . The right lung is clear . No pneumothorax is identified . Remote left third anterior rib fracture is identified , but no acutely displaced fractures are otherwise seen .
    OUTPUT:
    
Left lower lobe patchy opacity , likely atelectasis with small left pleural effusion . No displaced fractures are visualized . If there is continued concern for a rib fracture , consider a dedicated rib series .