Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph was obtained . The lungs are well expanded and clear . There is no pleural effusion or pneumothorax . The heart is normal in size with normal cardiomediastinal contours . Left greater than right shoulder degenerative disease is greater than expected for age .
    OUTPUT:
    
No acute intrathoracic process .