Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post thoracentesis with decreased right - sided pleural effusion , but incomplete reexpansion of the right lung base with small basal pneumothorax . Retrocardiac atelectasis is likely also present . Mild vascular engorgement is seen with normal cardiomediastinal contours .
    OUTPUT:
    
Small basal right pneumothorax . Findings discussed with Dr . ___ by Dr . ___ at 16 : 57 one minute after discovery on ___ .