Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low and there is resultant bibasilar atelectasis . There is no focal opacity concerning for pneumonia ; however , a round opacity projecting over the ninth right posterior rib most likely represents a nipple shadow . There is no pleural effusion or pneumothorax . The heart size is normal . The aortic knob is calcified . There is an azygos fissure . A plate and screws transfix a right humerus fracture . There are degenerative changes within the left shoulder joint .
    OUTPUT:
    
No focal opacity concerning for pneumonia .