Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Linear atelectasis is noted in both lung bases . No focal consolidation , pleural effusion or pneumothorax is seen . There is gaseous distention of the large bowel loops within the left upper quadrant of the abdomen . No acute osseous abnormalities are present .
    OUTPUT:
    
Bibasilar linear atelectasis .