Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . The known sub carinal mass may account for effacement of the aortopulmonary window . A right mainstem bronchus stent is seen . There are increased vascular and interstitial markings , right - greater - than - left , with more focal patchy and confluent opacity at the right lung base . Small right pleural effusion can not be excluded . The left costophrenic sulcus is clear . No pneumothorax is detected .
    OUTPUT:
    
1 . Right mainstem bronchus stent present . No pneumothorax detected . 2 . Increased interstitial markings . More focal opacities at the right lung base could represent a postobstructive pneumonia and followup imaging to confirm resolution is recommended . 3 . Stellate right right upper lobe lesion seen on the recent CT scan is not definitely appreciated radiographically . As per the recent chest CT , if clinically indicated , PET - CT could help for further assessment .