Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well - expanded and clear . No focal consolidation , effusion , edema , or pneumothorax . The heart remains top - normal in size . Mediastinal contours are unchanged . Degenerative changes of thoracic spine are mild - to - moderate .
    OUTPUT:
    
No focal pneumonia . Top - normal / mild cardiomegaly , unchanged .