Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is again at the upper limits of normal size . The aorta shows mild unfolding . A right upper mediastinal density produces an oval shadow measuring up to ___ x 40 mm which can be compared to the prior radiographic appearance from ___ when the same measurement within ___ x 25 mm so there has been an increase . However , previous studies showed that there was a benign cyst at the site so the appearance is consistent with some long - term increase in the size of a benign cyst . The airway is again splayed minimally to the left but does not appear narrowed or under substantial mass effect . The lungs appear clear . There no pleural effusions or pneumothorax .
    OUTPUT:
    
Increased size of mediastinal cyst . No evidence of acute cardiopulmonary disease .