Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright view of the chest was reviewed and compared to the prior studies . The tracheal stent in the right main bronchus has been removed . Right perihilar opacity represents metastatic disease that has significantly decreased since ___ due to radiation therapy . Multiple nodules seen throughout both lung fields are better characterized on the previous CT of ___ . New increased opacification in the left upper lung could be due to patient rotation or an infectious process . Normal cardiac , pleural and mediastinal surfaces .
    OUTPUT:
    
1 . Increased opacity in the left upper lung could be due to patient rotation or an infectious etiology if clincal symptoms are present . 2 . The right hilar opacity corresponds to known metastatic disease and has significantly decreased in size since ___ due to radiation therapy .