Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs provided . Lung volumes are slightly low . There is no focal consolidation , pleural effusion , or pneumothorax . Cardiomediastinal silhouette is mildly enlarged since the prior exam . Old healed rib fractures are noted on the right .
    OUTPUT:
    
Development of mild cardiomegaly .