Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are mildly reduced . The heart size is top normal , unchanged . Mediastinal and hilar contours are unremarkable . The pulmonary vasculature is normal . Patchy left basilar opacity likely reflects atelectasis . No pleural effusion or pneumothorax is visualized . Previously noted nodules within the lungs on CT are not clearly demonstrated on the current radiograph . There are no acute osseous abnormalities .
    OUTPUT:
    
Patchy opacity in the left lower lobe likely reflects atelectasis .