Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal chest radiograph again demonstrates a normal cardiomediastinal silhouette . Left mid to lower lung parenchymal opacities are slightly increased , consistent with progression of the known left lower lobe pneumonia . Increased opacity at the left base is could be due to increased effusion versus worsening consolidation . Effusion is more likely , given rightward shift of the mediastinum . The right lung is clear . There is no pneumothorax .
    OUTPUT:
    
Progression of the known left lower lobe pneumonia . Increased left base opacity could be due to increased effusion versus worsening consolidation , with effusion more likely given rightward shift of the mediastinum . If further characterization is needed , CT can be obtained .