Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is large but improved compared to prior study . The mediastinal and hilar contours are unremarkable . There has been interval decrease of the right - sided pleural effusion with still a small amount of residual fluid remaining . Right basal atelectasis is present . There is no pneumothorax .
    OUTPUT:
    
Status post thoracentesis with decrease in right pleural effusion and residual right lower lung atelectasis , but no pneumothorax .