Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs . There is an opacity in the left lung base . There is no pleural effusion or pneumothorax . Single lead pacer tip is in the right ventricle . There is no pneumothorax . The cardiomediastinal silhouette is stable .
    OUTPUT:
    
New left basilar opacity compatible with pneumonia .