Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . There has been substantial decrease in size of the right hilar and paratracheal mediastinal mass compared to the previous radiograph . Hilar contours are otherwise unremarkable . Pulmonary vasculature is not engorged . Mild increased interstitial opacities are noted within the lungs diffusely . No focal consolidation , pleural effusion or pneumothorax is present . Streaky atelectasis is noted in the lung bases . No acute osseous abnormality is present .
    OUTPUT:
    
Mild increased interstitial opacities diffusely , could suggest an atypical infection including viral infection . Mild atelectasis in the lung bases . Substantial interval decrease in size of right perihilar and paratracheal mediastinal mass .