Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided demonstrate dual - lead pacer with lead tips extending into the right atrium and right ventricle , unchanged . There is slight interval worsening of pulmonary interstitial edema . The heart remains moderately enlarged . There is a vague opacity in the left lower lobe which is essentially unchanged compared with prior exams and it corresponds with known lung cancer . Bony structures are intact .
    OUTPUT:
    
Pulmonary interstitial edema , mild cardiomegaly , left lower lobe mass .