Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest were provided . Lung volumes are quite low , which limits the evaluation . Residual contrast is noted in the colon . Dense band - like opacity is noted in the left lower lung which may reflect chronic atelectasis given the stable appearance over time . Otherwise , the lungs appear clear , though low lung volumes somewhat limit the evaluation . Heart size can not be assessed . Mediastinal contour is stable . Bony structures appear intact .
    OUTPUT:
    
Stable band - like opacity in the left lower lung is most compatible with chronic atelectasis . Limited study without definite signs for acute interval changes .