Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well inflated and clear . There may be a 1 .4 cm retrocardiac nodule just anterior to the lower thoracic spine . The cardiomediastinal silhouette , hilar contours , and pleural surfaces are normal . There is no pleural effusion or pneumothorax . Calcifications of the aortic arch is again noted . Visualized upper abdomen is unremarkable . Osseous structures are grossly intact .
    OUTPUT:
    
1 . No evidence of acute cardiopulmonary process . 2 . Possible 1 .4 cm retrocardiac lung nodule just anterior to the lower thoracic spine .