Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lateral left base opacity , increased in the prior study , is worrisome for pneumonia . The lungs remain hyperinflated , consistent with chronic obstructive pulmonary disease . No large pleural effusion is seen . There is no pneumothorax . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Left lower lobe pneumonia . Recommend followup to resolution . Difficult to exclude an additional focus of infection in the right mid to lower lung . COPD .