Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . A left - sided dual - chamber pacemaker is noted , in stable position . The cardiac silhouette remains enlarged . The aorta is tortuous . Again seen is a hiatal hernia . No definite consolidation is identified . Minimal opacity in the left base may represent atelectasis . There is no large pleural effusion or pneumothorax .
    OUTPUT:
    
No acute intrathoracic abnormality .