Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aortic knob is minimally calcified . Mediastinal and hilar contours are unchanged . The pulmonary vasculature is normal . Patchy opacity within the right lung base may reflect atelectasis though aspiration is not excluded . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities . Degenerative changes are again noted within the lower thoracic spine . Remote right rib fracture is re-demonstrated .
    OUTPUT:
    
Patchy right basilar opacity may reflect atelectasis but aspiration is not excluded in the correct clinical setting .