Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . A small opacity is seen in the right lung base , possibly representing atelectasis , but can not exclude early pneumonia or aspiration in the right clinical setting . Mild cephalization is noted , but no overt pulmonary edema is seen . There is no pleural effusion or pneumothorax . The mediastinum is widened , primarily due to an enlarged aorta , which could be aneurysmally dilated . The cardiac silhouette is enlarged .
    OUTPUT:
    
Opacity in the right lung base , possibly representing atelectasis , but can not exclude an early pneumonia or aspiration in the right clinical setting . Recommend shallow oblique radiographs to further evaluate .