Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post prior median sternotomy and coronary bypass surgery . Heart is upper limits of normal in size . Mediastinal and hilar contours are as well as pulmonary vascularity are normal . Lungs and pleural surfaces are clear .
    OUTPUT:
    
No radiographic evidence of pneumonia or other explanation for cough .