Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are well inflated and clear bilaterally with stable upper zone redistribution of vasculature . There is no pleural effusion or pneumothorax . No areas of focal consolidation , masses or lesions are identified . Aorta is mildly tortuous , and heart is top normal in size . Pleural surfaces are unremarkable . An NG tube is seen properly placed entering the stomach and then out of view . Stimulator is in place , unchanged in position , projecting over the lower thoracic spine .
    OUTPUT:
    
No evidence of infection or malignancy .