Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral radiograph ___ at 20 : 20 is submitted
    OUTPUT:
    
Right large bore internal jugular catheter unchanged in position . Left - sided single lead pacer also unchanged in position , although the distal portion of the lead is difficult to see due to technique . Lung volumes remain low . Focal opacity seen at the left base is seen and in the correct clinical setting would be concerning for left lower lobe aspiration or pneumonia , less likely atelectasis . There is improved aeration at the right base . No pulmonary edema . Overall cardiac and mediastinal contours remain stable . No pneumothorax .