Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . Analysis is performed in direct comparison with the next preceding AP single view chest examination of ___ . The heart size remains unchanged and is within normal limits . Unremarkable appearance of thoracic aorta . The pulmonary vasculature is not congested . No evidence of acute pulmonary parenchymal infiltrates are present , and the lateral and posterior pleural sinuses are free . Again identified is a nodular round density superimposing the right hilar structures on the frontal view . The lateral view localizes this pulmonary mass into the anterior segment of the right upper lobe . The previously present left subclavian approach central venous line has been removed and there is no evidence of pneumothorax and no new suspicious pulmonary parenchymal densities or masses can be identified . It is noted that the patient has undergone sequential CT torso examinations with the latest CT examination dated ___ . Although size determination based on chest x-ray can not be easily compared with CT findings , comparison of the coronal view of the chest CT of ___ suggests stable size or only minor progression . It can also be stated that a mass lesion directly within the hilum has not resulted in any marked progression . There is , however , a small prominent right - sided contour in the superior mediastinum at the level of the aortic arch . This contour is directly located over the right tracheobronchial angle . Evaluation of these possible minor changes would , however , require a repeat followup CT .
    OUTPUT:
    
Stable right - sided mass identified . Possible beginning new mass in superior mediastinum . No evidence of new acute pulmonary infiltrates , cardiac enlargement or vascular congestion .