Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is mildly enlarged and the hilar contour is and are normal . Convexity of the right lateral mediastinal border is likely a dilated azygos vein indicative of increased central venous pressure . Lungs are clear . There is no pleural effusion or pneumothorax . Moderate sized hiatal hernia is unchanged from the a CT of the abdomen and pelvis dated ___ .
    OUTPUT:
    
No evidence of intrathoracic infection , pleural effusion or pulmonary edema .