Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Comparison is made to prior examination of ___ . The heart is normal in size . The mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . The lungs are clear . There are no pleural effusions .
    OUTPUT:
    
Normal examination . No evidence of pneumonia . Please note that opportunistic infections may be radiographically occult , and if clinical suspicion is high , chest CT may be considered for further evaluation .