Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is apparent interval increase in size of a right perihilar mass , with less well - defined borders , and the appearance of a hazy opacity in the right upper lobe distal to the mass which would be concerning for a post-obstructive pneumonia . Cardiomediastinal and hilar contours are unremarkable . A tracheostomy tube is in unchanged position , ending 3 .7 cm above the carina . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Slight interval increase in size of perihilar mass with right upper lobe distal opacity raising concern for postobstructive pneumonia . Clinical correlation is advised .