Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is a pacemaker type device , overlying the left upper chest , with 3 leads noted . It the inferior approach catheter seen on the prior film , presumably a Swan - Ganz catheter , has been removed . If again seen is a left - sided chest tube . No well - defined pneumothorax is identified , though subtle pneumothorax might not be apparent on this exam . On today 's exam , a thin linear lucency projects over the cardiac silhouette , of uncertain etiology or significance . There has been some interval clearing of the left lower lobe collapse and / or consolidation , with partial visualization of the left hemidiaphragm on today 's exam . Vascular engorgement left upper zone is again noted , similar to the prior study . Possibility of a small left effusion would be difficult to exclude . Subcutaneous emphysema along the lower left chest wall again noted . The right lung is unchanged , with atelectasis in the infrahilar region . No CHF or right pleural effusion identified . Note is made that the right cardiac border is well defined . Small calcified granuloma in the right upper lung is again noted .
    OUTPUT:
    
Interval removal of presumed Swan - Ganz catheter . Slight interval improvement in left base opacity . Otherwise , I doubt significant interval change . Please note that although no obvious pneumothorax is detected , a subtle pneumothorax might not be apparent on this examination .