Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Dual - lead left - sided AICD is again seen , unchanged in position , with leads extending to the expected positions of the right atrium , right ventricle , and coronary sinus . The cardiac silhouette is mildly enlarged . There is prominence of the central vasculature and perihilar haziness consistent with mild pulmonary edema . There is persistent slight blunting of the right costophrenic angle , which could be due to pleural thickening / scarring versus trace pleural effusion .
    OUTPUT:
    
Mild cardiomegaly and mild pulmonary edema . Slight blunting of the right costophrenic angle could be due to a small pleural effusion versus chronic pleural thickening / scarring .