Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were obtained . These demonstrate clear lungs bilaterally with no focal opacity identified . Patient is status post median sternotomy with wires in unchanged position . Heart size is borderline enlarged , stable since prior examination dated ___ . The mediastinal contour appears unchanged , the mediastinal convexity compatible with ascending and descending tortuous or dilated aorta . Osseous structures are without acute abnormality .
    OUTPUT:
    
No acute intrathoracic abnormality .