Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low and there is again mild relative elevation of the left hemidiaphragm , somewhat increased . The right costophrenic angle is difficult to assess and a small pleural effusion is difficult to exclude . Increased opacity is present at the left lung base although probably compatible with atelectasis .
    OUTPUT:
    
Increased left basilar opacity , probably attributed to that volume loss and atelectasis . Pneumonia is not entirely excluded , however . If potential infection remains a clinical concern , short - term follow - up radiographs may be helpful .