Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left pectoral ICD with right atrial lead following its expected course and right ventricular lead oriented superiorly with proximal electrode spanning the SVC . Flattening of the hemidiaphragms suggests hyperinflation . Stable , moderate cardiomegaly . Stable widening of the mediastinum . Clear lungs . No pneumothorax or hemothorax . No appreciable pericardial effusion , but would not expect chest radiograph to detect a pericardial effusion .
    OUTPUT:
    
No pneumothorax . No appreciable pericardial effusion , but would not expect chest radiograph to detect a pericardial effusion . Mildly hyperinflated lungs .