Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomegaly is mild . There is left lower lobe opacity concerning for pneumonia . Lateral view would aid in overall assessment . No large effusion is seen . Mild hilar congestion difficult to exclude . No pneumothorax . Mediastinal contour is normal . Bony structures are intact .
    OUTPUT:
    
Left lower lobe opacity concerning for pneumonia . Possible mild hilar congestion .