Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate clear lungs without pleural effusion or pneumothorax . The cardiac silhouette is moderately enlarged . Note is made of calcification of the aortic knob . There is a moderate scoliosis of the thoracic spine .
    OUTPUT:
    
Unchanged cardiomegaly , without acute chest abnormality .