Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is top normal . Mediastinal and hilar contours are within normal limits . Pulmonary vasculature is normal . Patchy atelectasis is noted in the lung bases without focal consolidation . No pleural effusion or pneumothorax is evident . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild bibasilar atelectasis .