Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Insertion of a right - sided pigtail catheter . No pneumothorax . Minimal interval decrease in the moderate right - sided pleural effusion . Given for differences in technique the left pleural effusion has not significantly changed . There is basal atelectasis . No interstitial edema . Moderate cardiomegaly .
    OUTPUT:
    
No pneumothorax after right pigtail catheter insertion . Slight interval decrease in the right - sided moderate effusion .