Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is moderate interstitial pulmonary edema . The central pulmonary vasculature appears engorged . The previously described left posterior basilar opacity is again seen , and may represent atelectasis or pneumonia in the appropriate clinical setting . The heart remains enlarged . The aorta is tortuous . A single lead pacemaker is present with the lead terminating in the right ventricle .
    OUTPUT:
    
1 . Moderate edema . 2 . Previously described left posterior basilar opacity is again seen , and may represent atelectasis or pneumonia in the appropriate clinical setting .