Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is opacity obscuring the left heart border , new since ___ , likely indicating lingular atelectasis . Dual - chamber pacemaker is seen with the leads in the expected location . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
1 . Lingular atelectasis , new since ___ . 2 . Dual - chamber pacemaker with the leads in expected location .