Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate clear lungs without effusion or pneumothorax . The cardiac silhouette is normal in size , mediastinal contours are notable for tortuosity of the thoracic aorta . The pulmonary vasculature is normal . Multilevel degenerative change of the thoracic spine , unchanged . There is marked gynecomastia .
    OUTPUT:
    
No acute chest abnormality .