Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate hyperexpansion of the lungs with flattening of the bilateral hemidiaphragms , consistent with emphysema . The cardiomediastinal silhouette is unchanged , with stable mild cardiomegaly . There is no evidence of pleural effusion , pulmonary edema , pneumothorax or focal consolidation concerning for pneumonia . Multilevel degenerative changes are present in the thoracic spine .
    OUTPUT:
    
No evidence of pneumonia .