Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral images of the chest demonstrate well expanded lungs . There is increased opacity at the left lung base which appears to be chronic at least since ___ . The current opacity may represent an acute on chronic process and is concerning for possible pneumonia . There is no pneumothorax or pleural effusion . Cardiomediastinal silhouette is unremarkable . Visualized osseous structures are unremarkable .
    OUTPUT:
    
Left basilar acute on chronic process concerning for pneumonia . After acute process resolves , recommend repeat chest radiograph to determine patient 's baseline chronic disease . These findings were communicated to Dr . ___ at 12 :30 pm on ___ .