Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest were acquired . There are bibasilar streaky opacities probably compatible with atelectasis , including suspected volume associated with mild relative elevation of the left hemidiaphragm . The lungs are otherwise clear . The heart size is normal . The mediastinal contours are normal . No pneumothorax is seen . Elevation of the left hemidiaphragm is noted . Deformities of the lower right posterior ribs likely relate to remote trauma .
    OUTPUT:
    
1 . Probable atelectasis at the lung bases , greater on the left than right , although aspiration and / or infection are not completely excluded . 2 . Old right posterior rib fractures .