Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrates clear lungs bilaterally . No focal opacification concerning for an infectious process is identified . Patient is status post median sternotomy and valve replacement . Heart size is enlarged . No findings concerning for pulmonary edema . There is no pleural effusion or pneumothorax . Osseous structures are without acute abnormality .
    OUTPUT:
    
No focal opacity concerning for pneumonia . Enlarged heart without evidence of pulmonary edema .