Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Dual lead pacer is seen projecting over the left chest with pacer leads terminating over the right atrium and right ventricle . Lung volumes are low and there is elevation of the right hemidiaphragm . Heart size is grossly unchanged . Atherosclerotic calcifications are seen within the aortic arch . There is no evidence of pneumothorax . Trace pleural fluid is possibly seen at the right costophrenic angle . There is retrocardiac opacity that likely represents atelectasis , although infection is not excluded . Surgical clips are seen projecting over the lower midline .
    OUTPUT:
    
1 . Retrocardiac opacity that likely reflects atelectasis , although infection is not excluded . 2 . Possible trace right - sided pleural effusion .