Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac and mediastinal contours appear unchanged . Left perihilar mass is difficult to directly compare with prior imaging but persists as a retrocardiac finding and seems to have decreased with appearance of cavitation . Streaky basilar opacities suggest minor atelectasis . The chest is hyperinflated . Trace pleural effusions can not be excluded .
    OUTPUT:
    
No definite acute disease . Suspected decrease in left perihilar mass with new cavitation although comparison with cross - sectional imaging is suggested for oncological surveillance if more detail is needed clinically .