Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right pleural effusion has significantly improved and is now mild . A tiny pneumothorax is seen in the apex measuring 4 mm . Left moderate pleural effusion is stable . There is no pulmonary edema . Mediastinal and cardiac contours are within normal limits . Right - sided pectoral pacemaker has an atrioventricular lead .
    OUTPUT:
    
Significant improvement of right pleural effusion post - thoracocentesis . New apical pneumothorax is minimal , measuring 4 mm .