Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right - sided chest tube is again visualized . There is a small right apical pneumothorax which is slightly smaller than on the study from 5 hr previous . A small right pleural effusion is unchanged . The left lung continues to be clear .
    OUTPUT:
    
Small right apical pneumothorax , slightly smaller than on prior exam .