Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable frontal chest radiograph demonstrates clear well - expanded lungs . There is no pleural effusion or pneumothorax . The cardiac silhouette is moderately enlarged , the mediastinal contours are normal . The pulmonary vasculature is normal .
    OUTPUT:
    
Moderate cardiomegaly , without acute chest abnormality .