Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperinflated with flattening of the diaphragms consistent with chronic obstructive pulmonary disease , not effort dependent . The retrocardiac left lower lobe opacity has completely resolved . The mediastinal contours , cardiac borders , and heart borders are normal .
    OUTPUT:
    
1 . Complete resolution of the left lower lobe opacity . 2 . Chronic obstructive pulmonary disease , not effort dependent .