Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to radiograph from earlier the same day , new right - sided pigtail catheter with interval decrease in the right - sided pleural effusion which is now small . A very small right apical pneumothorax is suspected . Moderate cardiomegaly with left basal opacity . No interstitial edema .
    OUTPUT:
    
Status post right pigtail placement with significant interval decrease in right - sided effusion . A very small right apical pneumothorax is suspected .