Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal upright and lateral chest radiographs are obtained . Lungs are well expanded and symmetric bilaterally . Heart is normal in size and cardiomediastinal contours are unremarkable . Lungs are clear . There is no pleural effusion and no pneumothorax . Degenerative changes are noted in the spine .
    OUTPUT:
    
No acute intrathoracic abnormality .