Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interval improvement in heterogeneous lung opacities , which may have represented acute pulmonary edema superimposed upon more chronic lung disease . A focal opacity in the left retrocardiac region has slightly improved , and a small left pleural effusion is unchanged . Asymmetrical biapical thickening is again demonstrated , left greater than right , similar in appearance to ___ radiograph . Calcifications along the right hemidiaphragm pleural surface are also unchanged . Within the imaged portion of the upper abdomen , incompletely imaged distended loops of bowel are present , and could be more fully assessed by dedicated abdominal radiographs if warranted clinically .
    OUTPUT:
    
Rapid improvement in heterogeneous lung opacities , which may have represented acute pulmonary edema superimposed upon chronic lung disease . Improving left retrocardiac opacity , possibly due to atelectasis , but continued followup is suggested to document complete resolution and to exclude a lung nodule or mass in this area .