Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Underlying emphysema with mild left basilar scarring is present . No large effusion or pneumothorax . No convincing evidence for pneumonia or CHF . The heart size is normal . The mediastinal contour reflect an unfolded thoracic aorta . Bony structures are diffusely demineralized . No acute fracture is identified . A screw is seen within the left humeral neck .
    OUTPUT:
    
No acute findings .