Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is normal . Mediastinal and hilar contours are within normal limits . Pulmonary vasculature is normal . Patchy opacities are noted in the lung bases . No pleural effusion or pneumothorax is seen . Right PICC catheter tip terminates at the junction of the SVC and right atrium . No acute osseous abnormality is detected .
    OUTPUT:
    
Low lung volumes with patchy bibasilar airspace opacities most likely reflective of atelectasis , however infection or aspiration can not be completely excluded in the correct clinical setting .