Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP upright portable chest radiograph demonstrates median sternotomy wires and several mediastinal clips . Heart is enlarged although stable relative to prior study . There is no evidence of pulmonary edema . No pneumothorax or large pleural effusion . Lung volumes are low without a focal opacity . Chronic right lateral pleural thickening is noted and unchanged .
    OUTPUT:
    
No interval change with stable mild cardiomegaly without pulmonary edema .