Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette is upper limits of normal in size but stable compared to the prior exam . Tortuosity of thoracic aorta also appears unchanged . Lungs remain clear , and there are no pleural effusions or acute skeletal findings .
    OUTPUT:
    
Stable chest radiographic findings with no abnormalities to suggest the presence of a primary lung cancer . However , if clinical suspicion persists , a diagnostic chest CT may be considered as it is more sensitive than radiographs for this diagnosis .