Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs were obtained . Lung volumes are low but clear . The cardiac silhouette is mildly enlarged . Mediastinal and hilar contours are stable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Mild cardiomegaly with no pulmonary edema . No pneumonia .