Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly lower compared to the previous exam . Heart size is top normal . Mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Minimal patchy left lower lobe opacity likely reflects atelectasis . No focal consolidation , pleural effusion or pneumothorax is seen .
    OUTPUT:
    
Minimal left lower lobe patchy opacity , likely atelectasis , without focal consolidation .