Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post AVR . A small amount of free air in the left lower hemithorax is new with suggestion of deep sulcus sign . The left internal jugular venous catheter tip position is unchanged when accounting for differences in technique and lower lung volumes . Small to moderate edema and pulmonary vascular congestion . Enlarged cardiac mediastinal silhouette overall unchanged and within limits postoperatively . A chest tube projects over the left hemithorax . Median sternotomy wires appear intact .
    OUTPUT:
    
1 . Small left basal / subpulmonic pneumothorax . 2 . Mild - to - moderate volume overload .