Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top normal . Mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . Patchy opacities are demonstrated in both lung bases without focal consolidation . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities . No subdiaphragmatic free air is present .
    OUTPUT:
    
Probable bibasilar atelectasis . No subdiaphragmatic free air .