Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to the previous radiograph , post radiation changes at the right apex and bilateral hilar enlargement is stable . Heart is normal in size . Lungs are otherwise clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Stable post radiation changes , without evidence of pneumonia . 2 . Pulmonary arterial hypertension .