Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were reviewed and compared to the prior study . A focal opacity in the lingula was present on the CT from ___ and is at least 12 days old and most likely represents residua of an infection that has cleared . The aorta is enlarged and tortuous , but not focally aneurysmal . Normal heart and pleural surfaces .
    OUTPUT:
    
Focal lingular opacity is at least 12 days old and most likely represents residua of an infection that has cleared .