Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Fullness of the left perihilar region corresponds to known mass , better assessed on the previous CT , and appears unchanged from the prior radiograph . Right hilar and mediastinal contours are similar . Pulmonary vasculature is normal . The lungs are hyperinflated with mild emphysematous changes again noted in the lung apices . Minimal atelectasis is seen in the lung bases . No focal consolidation , pleural effusion or pneumothorax is demonstrated .
    OUTPUT:
    
No substantial interval change from the prior study . Fullness of the left perihilar region compatible with known mass , better assessed on the prior CT . Emphysema . No focal consolidation .