Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild right lung base opacity is likely atelectasis , however pneumonia is possible in correct clinical setting . There is no pneumothorax or large pleural effusion . Mildly enlarged cardiac silhouette is similar to before . Sternotomy wires are intact .
    OUTPUT:
    
Mild right lung base opacity is likely atelectasis . Chronic mild to moderate cardiomegaly . No evidence of cardiac decompensation . Although no acute fracture or other chest wall lesion is seen , conventional chest radiographs are not sufficient for detection or characterization of most such abnormalities . If the demonstration of trauma to the chest wall is clinically warranted , the location of any referrable focal findings should be clearly marked and imaged with either bone detail radiographs or Chest CT scanning .