Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Severe , abnormal convexity of the right mediastinal border with visualization of the pulmonary vessels is consistent with the known anterior mediastinal mass . Interval change in the size of the right mediastinal mass can not be adequately determined due to the differences in lung volume and technique compared to the prior exam from ___ ; however , the mass appears grossly larger on the lateral view . Recommend CT chest with contrast for better assessment . Interval improvement in bibasilar atelectasis . Stable , mild cardiomegaly . Left hilar contours are normal . No pneumothorax or pleural effusion .
    OUTPUT:
    
Right , prevascular mediastinal mass appears grossly larger on the lateral view . Recommend CT chest with contrast for more adequate assessment of size and vascular complications .