Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in semi-upright position . Analysis is performed in direct comparison with the next preceding similar study dated ___ . The postoperative small right apical pneumothorax has further regressed and only a small approximately 1 - cm wide gap remains . The position of the previously described chest tube is unaltered . Unchanged findings concerning sternotomy and rather normal heart size without evidence of pulmonary congestion . No new pulmonary parenchymal abnormalities are present and the previously described rather extensive chest wall emphysema has regressed .
    OUTPUT:
    
Decreasing small postoperative pneumothorax on right side . No new abnormalities .