Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Overlying trauma board limits assessment . Lung volumes are low . Heart size is borderline enlarged , but accentuated due to the low lung volumes . Mediastinal contour is normal . There is crowding of the bronchovascular structures . Hilar contours are otherwise unremarkable . No large pleural effusion or pneumothorax is identified though subtle increased lucency at the right lung base and along the right heart border could suggest a small pneumothorax . Deformity of the left seventh lateral rib appears to be chronic . No acutely displaced fracture is visualized .
    OUTPUT:
    
Slightly increased lucency within the right lung base along the right heart border suggests a small pneumothorax . Please see subsequent CT of the torso for further details .