Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . No prior . There is patchy opacity identified at the left lung base , in the lower lobe . Elsewhere , the lungs are clear . There is no pleural effusion . Cardiomediastinal silhouette is normal . Osseous and soft tissue structures are unremarkable .
    OUTPUT:
    
Left lower lobe pneumonia .