Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Small left apical pneumothorax measures 15 mm , unchanged since previous exam . Left chest tube projects at the left upper hemithorax . Left small pleural effusion has imroved and is now minimal . Left - sided pacemaker has leads in the right atrium and ventricle . Right lung is unremarkable .
    OUTPUT:
    
1 . Unchanged small left apical pneumothorax after pacemaker placement . 2 . Improvement of small left pleural effusion which is now minimal .