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 portable single view chest examination of ___ . Heart size is unchanged and the same holds for the appearance of the thoracic aorta . Previously described right - sided perihilar mass , grossly unchanged . Within this density one can identify the metallic structures of the stent , which has been placed in the right - sided main bronchus partially seen to occupy portions of the carina . There is no evidence of any airway obstruction through the stent . There is no evidence of new atelectasis distal to the stent which ventilates the area of the right lower and middle lobes . Comparison of the frontal views ; however , suggests new local parenchymal density in the central portion of the right middle lobe as can be identified also on the lateral view . The previously identified increased interstitial markings in the left upper lobe persist and may have increased slightly . They are believed to represent interstitial carcinomatosis . The lateral and posterior pleural sinuses remain free , thus there is no evidence of significant pleural effusion . The on multiple previous examinations identified abnormalities and local pleural thickening in the right axillary area remain grossly unchanged .
    OUTPUT:
    
No evidence of main bronchus stent occlusion . Some progression of pulmonary abnormalities is , however , noted .