Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Aorta is tortuous . Hilar contours are unremarkable . Pulmonary vascularity is not engorged . Linear opacities in the left lung base are compatible with subsegmental atelectasis . There are low lung volumes . Crowding of the bronchovascular structures is noted . Patchy opacity within the right lung base may reflect an area of atelectasis or infection . No pleural effusion or pneumothorax is identified . Elevation the right hemidiaphragm is noted . Partially imaged are trace density the right upper quadrant of the abdomen .
    OUTPUT:
    
Low lung volumes . Patchy right basilar opacity may reflect atelectasis though infection can not be completely excluded .