Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Dual lead defibrillator remains in stable position with leads in the right atrium and right ventricle . No pneumothorax or pleural effusion . Mildly enlarged cardiac silhouette is stable . Pulmonary vascular congestion has slightly progressed . New linear opacity in the right middle lobe likely atelectasis .
    OUTPUT:
    
No pneumothorax . Mild interstitial pulmonary edema and right middle lobe atelectasis .