Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright AP view of the chest was provided . Patient is rotated to the right , low lung volumes limit evaluation . There is mild bibasilar atelectasis . No definite signs of pneumonia or CHF . No large effusion or pneumothorax seen . Heart size can not be assessed . Mediastinal contour is normal . Bony structures are intact .
    OUTPUT:
    
Mild bibasilar atelectasis , no definite signs of acute intrathoracic process .