Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Semi-upright AP and lateral views of the chest demonstrate adequate lung volumes , with clear lungs . There is no pleural effusion or pneumothorax . The cardiac silhouette is mildly enlarged , the mediastinal contours remain normal . The pulmonary vasculature is normal .
    OUTPUT:
    
Mild cardiac enlargement ; no pneumonia .