Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single lead pacemaker device again terminates in the right ventricle . The heart appears mild to moderately enlarged . The aortic arch is calcified . Each hilum appears mildly engorged but it is not necessarily clear that this would represent a clinically significant acute finding . Minimal retrocardiac opacification is typical for atelectasis .
    OUTPUT:
    
No definite acute process . If pulmonary symptoms are present , however , then short - term followup radiographs may be helpful .