Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrates clear lungs bilaterally . Lungs appear slightly hyperinflated . Cardiomediastinal and hilar contours are within normal limits . There is no pleural effusion , pneumothorax , or evidence of pulmonary edema . No air under the right hemidiaphragm . Multilevel degenerative changes throughout the imaged thoracolumbar spine are noted . Left humeral head prosthesis is incompletely imaged .
    OUTPUT:
    
No convincing evidence of pneumonia .