Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided PICC line ends at mid SVC . A pleural pigtail catheter is present at right lung base . No significant interval changes in the chest since ___ . Opacity at the right lung base which is likely atelectasis and presumed small residual effusion are stable . Left lung is clear . There is an evidence of prior median sternotomy . Sternal sutures are intact . Heart size , mediastinal and hilar contours are normal . No pneumothorax .
    OUTPUT:
    
1 . No pneumothorax . 2 . Small right lung base atelectasis and presumed small right pleural effusions are unchanged .